tires

I can't remember the last time I had to put air in my tires for my cars and trucks.

N2 molecule fatter than O2: true, but irrelevant. If you have to air up your tires often, you have a leak. Using N2 isn't going to help. Some people report that they never had to refill their tires for a year after switching to N2. I use normal air in my pickup and I've never had to refill the tires over seven years, either. Sounds like hype.

N2 "dissapate heat better"? Would you explain this?

Regarding stable tire pressures....it's not that Nitrogen is more stable for pressures, expands less, etc. Remember the Gas Laws in High School (or, hopefully by College Freshman Chemistry):

PV=NRT

Regardless of the gas. According to this equation, the temperature/pressure curves for O2 and N2 are identical or nearly so. Or for that matter, for H2, He, Ar, etc, etc.

What is at issue here is MOISTURE. Get rid of the moisture and the pressure differences are less. For passenger cars, filling your tires with Nitrogen is worthless unless you purge ALL the moisture out of the tires FIRST. To not purge the air out of the tire first before filling with N2 is a waste of time and money (it's worthless in any case for passenger cars, but for the sake of argument....). So, if you do decide to "air" up with N2, make SURE they purge all the moisture out first. However, N2 is completely unnecessary and provides zero benefits. It just drains your wallet.

In any case, the differences between using N2 and air (with the associated moisture) in passenger cars are negligible. Race teams use N2 because a small, less than 1/2 PSI, difference makes a huge difference in handling at the temps and speeds those race tires are constantly subjected to. For passenger cars, this is nonsense.

Nitrogen: the new Marvel Mystery Oil

As for even wear or longer lasting tires, I use plain old air and rotate every 10,000 miles and air them up to 41 PSI COLD (exc my STS which I air up to 35). I *always* get 100,000+ miles out of each set when the tires are rated for 60,000 or 80,000 miles. This is over more than six sets of tires.

Car tires are engineered for use with plain air for crying out loud.

Guys, it's all about maintenance and how you use your car, not snake oil.

For passenger cars, using dry air would perform the exact same function as N2. Some people use air dryers on their air compressors. Not necessarily cheaper, though.

Why N2, then? It's the cheapest source of a dry gas, nothing more.

Someone decided that since some airplanes use N2 for the tires, it must be a good idea. Bzzzzt. Wrong. Airplanes use N2 for tires for DIFFERENT reasons, none of them applicable to passenger cars.

Airliners use N2 because the tires are VERY expensive and corrosion due to ozone and oxygen reduces their life and safety margins. I can't imagine any car that had tires corroded from the inside. Often, tires used by airlines are not owned by the airlines, but leased from the tire manufacturer (e.g. Goodyear, Michelin). So, the longer they can make them last, the more $$$ for the likes of Goodyear and Michelin. When an airline tire wears out, they're not thrown away - they're recapped. Tire manufacturers are often paid by the number of landings made on their tires. So, the more landings a tire can survive, the more $$$ for tire vendors.

[[ I don't think even airlines change tires. A Jet was being serviced very near my hangars. The A&P mechanic was changing worn tires. One thing I noticed was that he didn't change the tire itself, he yanked off the entire wheel assembly leaving the tire on the wheel. The tire vendor had already mounted the tire on another wheel and shipped it. The mechanic simply swapped assemblies and shipped the old, worn assembly back. Looks like the tire vendor was making sure the tire was properly installed. ]]

Moisture in tires at very high altitudes (translation: very very cold) is a BAD thing. You don't want the moisture inside your tires condensing and then freezing. Liquid moisture is a disaster for airplane wheels let alone the resulting imbalance should solid water still exist inside the tire at landing.

Also, O2 and moisture in regular air will corrode airplane wheels. I don't remember the last time I or anyone had to replace a wheel due to corrosion from inside a car tire. In addition to this, hydrocarbon gasses released by the airplane tire itself can burn in the presence of O2. Very bad in an airplane, a non issue in a car. Further, N2 will put out a brake fire. The overpressure plugs in airplane wheels are pointed at the brakes. If there's a brake fire, the tire is likely also very very hot. At a certain pressure/temperature, the plugs release and direct the N2 stream at the burning brakes, putting out the fire.

Brake or tire fires on a car? Never heard of it. All of these events are non-issues for passenger cars or we would have seen the NHTSA or DOT require N2 in all car tires decades ago.

So, the point of this is to explain WHY airliners use N2 instead of air. The reasons have nothing to do whatsoever with anything applicable to passenger car tires.

Just because it's good for airplanes doesn't mean it makes sense for cars. Should I replace the sheetmetal in my STS with titanium alloy or carbon fiber ones? Should I replace my 16-way heated seats with 26Gee crash seats?

As for my airplanes (I've had ten), I've never filled them with N2 - no reason to. Tires wear out before oxidation occurs and the worn tires are thrown away. As for temperature stability, this is a non-issue. The situation is the same for cars.

Nitrogen: the new Marvel Mystery Oil

RedGalant2k1 is correct. Using N2 is no excuse for not regularly checking the tire pressures on your car (don't forget the spare!). If you use N2, I think you'll see zero benefits other than an emotional one.

So, is N2 in passenger cars and trucks bad? Nope.
Increased Gas Mileage? Hype.
Benefits? None for passenger cars.
Expense? Some, sometimes none.

Nitrogen: the new Marvel Mystery Oil

thu said:

I can't remember the last time I had to put air in my tires for my cars and trucks.

Click to expand...

Than you are one of the lucky few.

N2 molecule fatter than O2: true, but irrelevant. If you have to air up your tires often, you have a leak. Using N2 isn't going to help. Some people report that they never had to refill their tires for a year after switching to N2. I use normal air in my pickup and I've never had to refill the tires over seven years, either. Sounds like hype.

Click to expand...

Well if you have an oil leak synthetic oil will be no benefit either. Fix the leak and its a much better way to inflate your tires.

N2 "dissapate heat better"? Would you explain this?

Regarding stable tire pressures....it's not that Nitrogen is more stable for pressures, expands less, etc. Remember the Gas Laws in High School (or, hopefully by College Freshman Chemistry):

PV=NRT

Regardless of the gas. According to this equation, the temperature/pressure curves for O2 and N2 are identical or nearly so. Or for that matter, for H2, He, Ar, etc, etc.

Click to expand...

Not to pick apart your post section by section, but its easier for sake of my responses.

As you surely remember Nitrogen is an inert gas, Oxygen is not. There is a reason its used in Aircraft, Racing, and Mining industries. Oxygen is prone to flash point explosion from excessive heating. Which can be a result of either extreme weight resulting in increased temperature or the extreme of a shuttle on reentry to Earth's Atmosphere.

What is at issue here is MOISTURE. Get rid of the moisture and the pressure differences are less. For passenger cars, filling your tires with Nitrogen is worthless unless you purge ALL the moisture out of the tires FIRST. To not purge the air out of the tire first before filling with N2 is a waste of time and money (it's worthless in any case for passenger cars, but for the sake of argument....). So, if you do decide to "air" up with N2, make SURE they purge all the moisture out first. However, N2 is completely unnecessary and provides zero benefits. It just drains your wallet.

Click to expand...

Moisture is the main issue in passenger car tires thats absolutely correct. However when done properly you eliminate 99.9% of moisture. Thereby increasing the life of your vehicles tire and wheel from reduced corrosion and rusting.

In any case, the differences between using N2 and air (with the associated moisture) in passenger cars are negligible. Race teams use N2 because a small, less than 1/2 PSI, difference makes a huge difference in handling at the temps and speeds those race tires are constantly subjected to. For passenger cars, this is nonsense.

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Not nonsense at all. Race cars are not the only cars that are adversely affected from a 1psi change in tire pressure. Passenger car tires are subject to more extremes than race tires. Heat, cold, and moisture affect all but with use of tire warmers, and nitrogen inflation the race tires see only the extreme heat end of that spectrum.

Passenger car tires are subject to below freezing temperatures, burning hot 100+ degree temperature days, sometimes in the same day! Passenger car tires are also subject to moisture from the same dew build up that you see on your windows in the morning.

As for even wear or longer lasting tires, I use plain old air and rotate every 10,000 miles and air them up to 41 PSI COLD (exc my STS which I air up to 35). I *always* get 100,000+ miles out of each set when the tires are rated for 60,000 or 80,000 miles. This is over more than six sets of tires.

Click to expand...

Nothing even nitrogen is the replacement for proper care and maintenance of your vehicle and your tires. I'm glad your method works, but nitrogen inflation is beneficial.

Car tires are engineered for use with plain air for crying out loud.

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Not always.

For passenger cars, using dry air would perform the exact same function as N2. Some people use air dryers on their air compressors. Not necessarily cheaper, though.

Click to expand...

Air dryers are used to prevent rust build up in air compressors that destroys seals, engines, pumps, etc.

Oxygen retains moisture hence why you see oxydation and rust on anything metal.

Someone decided that since some airplanes use N2 for the tires, it must be a good idea. Bzzzzt. Wrong. Airplanes use N2 for tires for DIFFERENT reasons, none of them applicable to passenger cars.

Airliners use N2 because the tires are VERY expensive and corrosion due to ozone and oxygen reduces their life and safety margins. I can't imagine any car that had tires corroded from the inside. Often, tires used by airlines are not owned by the airlines, but leased from the tire manufacturer (e.g. Goodyear, Michelin). So, the longer they can make them last, the more $$$ for the likes of Goodyear and Michelin. When an airline tire wears out, they're not thrown away - they're recapped. Tire manufacturers are often paid by the number of landings made on their tires. So, the more landings a tire can survive, the more $$$ for tire vendors.[//quote]

How is that different than passenger car tires?

So, is N2 in passenger cars and trucks bad? Nope.
Increased Gas Mileage? Hype.
Benefits? None for passenger cars.
Expense? Some, sometimes none.

Nitrogen: the new Marvel Mystery Oil

Click to expand...

I've an average of 2-3 mpg better in my wifes car alone, besides all the other testing and information out there. I'm keeping nitrogen.

It has no downsides, and even if its only half as good as advertised its still better than traditional compressed air.

Click to expand...

RedGalant2k1 said:

As you surely remember Nitrogen is an inert gas, Oxygen is not. There is a reason its used in Aircraft, Racing, and Mining industries. Oxygen is prone to flash point explosion from excessive heating. Which can be a result of either extreme weight resulting in increased temperature or the extreme of a shuttle on reentry to Earth's Atmosphere.

Click to expand...

Right, I learned that N2 is an 'inert' gas in the seventh grade, as I'm sure you did. It was repeated to me all through my Chemical Engineering and Electrical Engineering cirriculums (cirricula?) all through University. And right through graduate school. However, I think the correct term is not "inert", it's "less reactive".

I'm not sure what you're trying to say. What you wrote doesn't make any sense. O2 cannot burn or explode on its own. As such, it doesn't have a flash point. I assume that you intended something other than what you wrote.

Oxygen cannot burn or explode on its own. It has to have something to burn. It's an oxidizer. As such, it needs something to oxidize such as fuel, something combustible. Assuming you meant that O2 can support a burning tire, this is a non-issue for cars.

In any case, corrosion on the *inside* of the tire (tire materials or the metal wheel) is a non-issue. You disagree with this?

The problem with your argument is that the majority of the tire surface is exposed to atmosphere. Hence, supposed oxidation problems will remain.

RedGalant2k1 said:

Moisture is the main issue in passenger car tires thats absolutely correct. However when done properly you eliminate 99.9% of moisture. Thereby increasing the life of your vehicles tire and wheel from reduced corrosion and rusting.

Click to expand...

Corrosion? When was the last time you heard that someone's tire failed due to corrosion from the *inside*?

Again, the problem with this argument is that the majority of the tire surface is exposed to atmosphere.

I don't think anybody is concerned about tire or wheel corrosion due to normal atmospheric moisture (humidity) in the tire cavity. The NHTSA sure isn't.

RedGalant2k1 said:

Passenger car tires are subject to below freezing temperatures, burning hot 100+ degree temperature days, sometimes in the same day! Passenger car tires are also subject to moisture from the same dew build up that you see on your windows in the morning.

Click to expand...

Uhhh....how does dew get inside the tire? LOL. I know what you mean, sorry. You meant that some of the moisture that's in an air'd tire will condense due to cold surface temps.

Seriously, one of your concerns about humidty is that it causes corrosion to the tire materials and wheel. Normal humidity levels of moisture in tire air causing corrosion is not an issue in passenger cars. You disagree with this?

RedGalant2k1 said:

Nothing even nitrogen is the replacement for proper care and maintenance of your vehicle and your tires. I'm glad your method works, but nitrogen inflation is beneficial.

Click to expand...

*If* there is a benefit, it's negligible and it doesn't exceed the cost.

Nitrogen: the new Marvel Mystery Oil

RedGalant2k1 said:

Not always.

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Hmmm....I don't recall any of the dozens of tires I bought over the last 20 years that said, "Use of air for inflation is not approved. Use N2 Only".

RedGalant2k1 said:

Oxygen retains moisture hence why you see oxydation and rust on anything metal.

Click to expand...

Excuse me, how does oxygen retain moisture? Please explain this concept to this Chemical Engineer and Pilot.

The key about N2 or dry air is to displace moisture. However, I think we actually agree about removing moisture despite your misunderstanding of oxidation.

RedGalant2k1 said:

How is that different than passenger car tires?

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Again, I ask, how many times have you seen car tire failures due to corrosion on the *inside*? How many times have you seen tire fires or brake fires on passenger cars?

My car tires are always replaced due to tread wear or road damage, not due to corrosion.

Have you replaced tires due to corrosion damage?

RedGalant2k1 said:

Not always.

Click to expand...

Of the dozens of passenger car tires I've bought over the last 20 years and the hundreds I've worked on, I don't recall seeing this on the tire, "Use of air for inflation is not approved. Use N2 Only".

RedGalant2k1 said:

I've an average of 2-3 mpg better in my wifes car alone, besides all the other testing and information out there. I'm keeping nitrogen.

Click to expand...

How does X PSI N2 give better mileage than X PSI air? Given identical pressures, the same force will be exerted on the tire tread and sidewalls, regardless of the gas and, hence, produces the same diameter tire. Yes, moisture in air'd tire will give a slightly higher pressure than an N2 tire when tires are at road temperature when both start out at the same cold pressure. But....that translates into better mileage, no? Understand the point I'm trying to make?

Clarification --> Cars A and B are both at 75*F (ambient) at start. Car A has N2 tires. Car B has air'd tires. Both cars start out COLD and at 35 PSI. Both cars take off. After five miles of driving at commuting speeds, Car A's tires are at 37 PSI and Car B's tires are at 37.2 PSI.

So, you're saying that the lower-pressured tire gives *better* mileage?

Me thinks that you might be getting gas mileage because your attention to tire inflation/maintenance is better than when you were using regular air.

When people claim better mileage using tire N2, filling up with N2 is probably the first time they are running their car tires at the proper pressure.

You might counter, "but N2 gives more stable inflations!". How does that produce better gas mileage?

"Testing and information out there"? What testing and information do you refer to? I've seen some of the hype. All of it I've seen comes from the N2 inflation equipment vendors and those selling the service and gas. I hope you're not using their data. I'm trying to be objective about this and I cannot, for the life of me, find independent data.

When looking at the reasons N2 inflation vendors and service centers explain why you should use N2, they almost always point to the fact that airplanes use N2 for various systems. Thus, they surmise, you should use it in your tires. This reason has nothing in common with passenger cars. None. Not even this "stable inflation" myth. Yes, inflation pressures won't vary as much with 97% pure N2 as they do with regular air, but this isn't the whole reason for using N2 in aircraft tires. I have a friend of a friend (both are fellow pilots) who has a Mooney (airplane). Some A&P decided he was going to use compressed air in the tires. The result? Upon take off, the tires heated up....tires expanded just a weeeeeee bit more than usual. Given the tight tolerances of aircraft parts, this wedged the tires in the wheel well. Guess what happened....the pilot couldn't lower the gear. He had to belly it in. How does this apply to car tires? It doesn't. I can't remember the last time someone aired up their tires with compressed air and then found that wheels wouldn't turn because they expanded just a weee bit more and jammed against the wells.

It doesn't apply to the fact that aircraft use N2 for the oleo struts to prevent oxidation pitting of the struts. Again, no application in a car. N2 in aircraft tires are used to put out tire fires and brake fires. Again, no application whatsoever in a car.

When you fill your tires with N2, don't forget to top off the headlight fluid and muffler bearing oil. LOL.

Again, I counter that N2 is NOT beneficial. It does no harm other than to drain your wallet.

N2 in passenger cars and trucks bad? Nope.
Increased Gas Mileage? Hype.
Benefits? None for passenger cars.
Expense? Some. I see places normally charge $5 to $10 per tire.

Nitrogen: the new Marvel Mystery Oil

thu said:

Right, I learned that N2 is an 'inert' gas in the seventh grade, as I'm sure you did. It was repeated to me all through my Chemical Engineering and Electrical Engineering cirriculums (cirricula?) all through University. And right through graduate school. However, I think the correct term is not "inert", it's "less reactive".

I'm not sure what you're trying to say. What you wrote doesn't make any sense. O2 cannot burn or explode on its own. As such, it doesn't have a flash point. I assume that you intended something other than what you wrote.

Oxygen cannot burn or explode on its own. It has to have something to burn. It's an oxidizer. As such, it needs something to oxidize such as fuel, something combustible. Assuming you meant that O2 can support a burning tire, this is a non-issue for cars.

In any case, corrosion on the *inside* of the tire (tire materials or the metal wheel) is a non-issue. You disagree with this?

Click to expand...

I disagree. Steel or aluminum wheels suffer rusting and corrosion on the inside all the time. Moisture still develops on the inside of the wheel. If you've ever looked inside any kind of car wheel your going to see some kind of corrosion or oxidation on the inside.

Regardless if oxygen doesn't ever explode or is fuel for another combustable source it still heats up quicker than nitrogen. Also it still allows for oxidation and rusting which nitrogen doesn't.

The problem with your argument is that the majority of the tire surface is exposed to atmosphere. Hence, supposed oxidation problems will remain.

Corrosion? When was the last time you heard that someone's tire failed due to corrosion from the *inside*?

Again, the problem with this argument is that the majority of the tire surface is exposed to atmosphere.

I don't think anybody is concerned about tire or wheel corrosion due to normal atmospheric moisture (humidity) in the tire cavity. The NHTSA sure isn't.

Click to expand...

Today actually. See I work in the retail tire industry. A tires steel belting rusts from the inside out and the better you are at controlling that the better life of the tire you get.

Uhhh....how does dew get inside the tire? LOL. I know what you mean, sorry. You meant that some of the moisture that's in an air'd tire will condense due to cold surface temps.

Seriously, one of your concerns about humidty is that it causes corrosion to the tire materials and wheel. Normal humidity levels of moisture in tire air causing corrosion is not an issue in passenger cars. You disagree with this?

Click to expand...

Actually yes. I see corrosion and rusting on the interior of tires and wheels on a daily basis. Corrosion/rusting is an issue in passenger cars and I guarantee you is an issue in Airplane tires.

*If* there is a benefit, it's negligible and it doesn't exceed the cost.

Nitrogen: the new Marvel Mystery Oil

Hmmm....I don't recall any of the dozens of tires I bought over the last 20 years that said, "Use of air for inflation is not approved. Use N2 Only".

Excuse me, how does oxygen retain moisture? Please explain this concept to this Chemical Engineer and Pilot.

Click to expand...

Not to sound mean, but if a Chemical engineer doesn't see that oxygen retains moisture maybe one should understand the word 'oxidation'. It wasn't termed that for no reason. In any case does that title give you more weight in your arguments? I have personal experience with hundreds of thousands of passenger car tires and wheels do you?

The key about N2 or dry air is to displace moisture. However, I think we actually agree about removing moisture despite your misunderstanding of oxidation.

Again, I ask, how many times have you seen car tire failures due to corrosion on the *inside*? How many times have you seen tire fires or brake fires on passenger cars?

My car tires are always replaced due to tread wear or road damage, not due to corrosion.

Have you replaced tires due to corrosion damage?

Click to expand...

Where do you think most tire issues come from? Dry rot, oxidation, rusting, and heat are all causes for premature tire wear.

Of the dozens of passenger car tires I've bought over the last 20 years and the hundreds I've worked on, I don't recall seeing this on the tire, "Use of air for inflation is not approved. Use N2 Only".

Click to expand...

I've never said (nor can I recall) anyone who promotes nitrogen stating its unsafe to refill or use traditional compressed air to inflated your tires. Infact I always advocate that the consumer ensure there tires are ALWAYS properly inflated and doing so with 'regular air' is perfectly acceptable.

How does X PSI N2 give better mileage than X PSI air? Given identical pressures, the same force will be exerted on the tire tread and sidewalls, regardless of the gas and, hence, produces the same diameter tire. Yes, moisture in air'd tire will give a slightly higher pressure than an N2 tire when tires are at road temperature when both start out at the same cold pressure. But....that translates into better mileage, no? Understand the point I'm trying to make?

Click to expand...

The same pressure is exactly that the same pressure. But you and I both know that 99% of people don't regularly check their tires inflation pressure. Nitrogen is more stable, subject to less moisture, hence a tire inflated with n2 will last longer.

When a tires inflation pressure changes it alters how the tire contacts the road, and when that happens you can lose up to 30% of a tires treadlife. Look I understand your arguments, but you aren't in the passenger car tire market I am and I see these issues on a daily basis.

Clarification --> Cars A and B are both at 75*F (ambient) at start. Car A has N2 tires. Car B has air'd tires. Both cars start out COLD and at 35 PSI. Both cars take off. After five miles of driving at commuting speeds, Car A's tires are at 37 PSI and Car B's tires are at 37.2 PSI.

Click to expand...

First of all nitrogen won't even get to 37psi.

So, you're saying that the lower-pressured tire gives *better* mileage?

Me thinks that you might be getting gas mileage because your attention to tire inflation/maintenance is better than when you were using regular air.

Click to expand...

The proper recommended pressure from the vehicle manufacturer gives better mileage.

When people claim better mileage using tire N2, filling up with N2 is probably the first time they are running their car tires at the proper pressure.

You might counter, "but N2 gives more stable inflations!". How does that produce better gas mileage?

Click to expand...

Seriously if all that you understand about nitrogen thinking its benefits are only in extreme conditions your crazy. I think you kill your own argument that nitrogen has no benefits right there.

For 99% of Americans who never check their air pressure nitrogen inflation is a huge benefit for them. Most tire failures are due to improper tire inflation.

"Testing and information out there"? What testing and information do you refer to? I've seen some of the hype. All of it I've seen comes from the N2 inflation equipment vendors and those selling the service and gas. I hope you're not using their data. I'm trying to be objective about this and I cannot, for the life of me, find independent data.

Click to expand...

I know you'll say this is biased, but here you go. www.getnitrogen.com has a wealth of infomation from critics to supporters. In the end your going to find anyone who actually puts up the cash to research this finds nitrogen is beneficial.

When looking at the reasons N2 inflation vendors and service centers explain why you should use N2, they almost always point to the fact that airplanes use N2 for various systems. Thus, they surmise, you should use it in your tires. This reason has nothing in common with passenger cars. None. Not even this "stable inflation" myth. Yes, inflation pressures won't vary as much with 97% pure N2 as they do with regular air, but this isn't the whole reason for using N2 in aircraft tires. I have a friend of a friend (both are fellow pilots) who has a Mooney (airplane). Some A&P decided he was going to use compressed air in the tires. The result? Upon take off, the tires heated up....tires expanded just a weeeeeee bit more than usual. Given the tight tolerances of aircraft parts, this wedged the tires in the wheel well. Guess what happened....the pilot couldn't lower the gear. He had to belly it in. How does this apply to car tires? It doesn't. I can't remember the last time someone aired up their tires with compressed air and then found that wheels wouldn't turn because they expanded just a weee bit more and jammed against the wells.

Click to expand...

You are in the airplane world, and your right airplanes are completely different from cars. However a small difference in tire pressure can still adversely affect a cars performance.

Automobiles don't have so excessively tight tolerances like aircraft, but air pressure is air pressure, it affects both.

It doesn't apply to the fact that aircraft use N2 for the oleo struts to prevent oxidation pitting of the struts. Again, no application in a car. N2 in aircraft tires are used to put out tire fires and brake fires. Again, no application whatsoever in a car.

Click to expand...

Actually there are automotive N2 filled struts and shocks for the same reason as aircraft to prevent corrosion and pitting of the strut rod/shock assembly.

When you fill your tires with N2, don't forget to top off the headlight fluid and muffler bearing oil. LOL.

Again, I counter that N2 is NOT beneficial. It does no harm other than to drain your wallet.

N2 in passenger cars and trucks bad? Nope.
Increased Gas Mileage? Hype.
Benefits? None for passenger cars.
Expense? Some. I see places normally charge $5 to $10 per tire.

Nitrogen: the new Marvel Mystery Oil

Click to expand...

Sad to see a chemical engineer doesn't see benefits in using nitrogen in passenger cars even though he apparently understands how nitrogen differs from oxygen.

I'll say this again I have experience with hundreds of thousands of car and light truck tires, you don't. I have dealt with every major tire and wheel manufacturer out there including the ones that sell and service airplane tires all of which support nitrogen inflation. So personally I think an average chemical engineer has less going his way that I do.

Look at the facts of why its used, don't form a biased opinion. Let your mind be open to the potential that it is better to use nitrogen to inflate your tires.

Why do you think N2 is used to fill those chip bags you buy out of your local vending machines?