: Chips to improve MPG?



alwayspaid-ntg
09-03-12, 07:25 PM
Anyone know of any chips or components that can be added to an 05 STS V8 that will improve MPG? I have seen some things out there but wondering if anyone actuallly tried anything specific that worked.

curtc
09-03-12, 08:39 PM
Nope, if you wanted fuel economy you bought the wrong car unfortunately... I consider the 21-23MPG avg. I get to be pretty damn good for a full sized car with a V8. If I wanted more I would've bought a used hybrid or diesel car...I opted for horsepower instead though.

dkozloski
09-03-12, 09:06 PM
Anyone know of any chips or components that can be added to an 05 STS V8 that will improve MPG? I have seen some things out there but wondering if anyone actuallly tried anything specific that worked.

Put a block of wood under the gas pedal so it will only depress about 1/4 the normal distance.

1BadCadSTS
09-04-12, 03:28 PM
^ :thumbsup:

eatyoursandwich
09-04-12, 03:36 PM
Without interrogating you, no there is no chip that will optimize MPG. You have to realize, millions of dollars went into R&D to build the N* V8. I doubt there is going to be an aftermarket company to best that.

Quick question; what platform did you come from? JDM?

curtc
09-04-12, 06:13 PM
This decal will boost MPG by 5

EChas3
09-04-12, 08:18 PM
Keep it under 2k RPM and raise your tire pressures.

You've got one of the best values in a Luxury Touring Sedan (add 'Sport' if so equipped). Gas is cheap.

Be glad you don't have an AWD. The mileage is even worse (gear/weight/etc.) and the OEM tires w' MRC could shake out fillings!

orange57
09-05-12, 02:14 AM
What MPG's are you seeing, and what are you expecting, or hoping for? Around town, the car doesn't get the greatest, but I have taken mine on a couple of road trips, and the 25-28mpg is very achievable on longer trips.

cooncat
09-05-12, 09:13 AM
Orange57, where are you getting 25 - 28 MPG? How fast were you driving? The most I got doing about 70 to maybe 75 is 24 MPG. The northstars are gas pigs, especially around. Gas is not cheap these days. My local Shell station today was raised to $3.80. I don't consider that cheap. I don't even do that much driving.

curtc
09-05-12, 10:39 AM
If you want MPG get a compact...these are full sized, V8 powered luxury cars (V6 if you cheaped out)...if you're concerned about gas cost you bought the wrong car...i don't even pay attention to it, drive it, fill it when it's empty... And enjoy all 320 horses! $60 ain't shit! If it is you shouldn't own a Cadillac, period.

Ludacrisvp
09-05-12, 10:59 AM
I have AWD with tires at 32psi and MRC. If I keep it at no faster than 65mph with almost all highway miles I can average 20.5 mpg on the tank. More spirited driving in the 75-80 range leads to about 17 mpg avg on the tank.
At 65 the rpm is about 1900 at 75-80 it's about 2100-2200. Not much rpm change but sure changes consumption.

curtc
09-05-12, 12:54 PM
I avg 20-22 MPG per tank, 70% highway. No complaints here.

dkozloski
09-05-12, 02:44 PM
I have an '06 V8 AWD STS with 3.23:1 gearing(GU5) and I get 22-24MPG highway.

curtc
09-05-12, 05:30 PM
I have an '06 V8 AWD STS with 3.23:1 gearing(GU5) and I get 22-24MPG highway.

That's right about what I get on the highway.

DarkMingBlueSTS
09-05-12, 05:48 PM
Lol is something wrong with my car then? I get like 18 mpg...3.6l

KRSTS
09-05-12, 05:49 PM
Lol is something wrong with my car then? I get like 18 mpg...3.6l

yes you have the OLD 3.6L

DarkMingBlueSTS
09-05-12, 06:22 PM
Is that normal for that motor...that is really what the question meant

curtc
09-05-12, 06:22 PM
I averaged 20-21 with my 04 CTS 3.6...could totally see the added weight of the STS skewing that number a bit.

DarkMingBlueSTS
09-05-12, 06:55 PM
Ok thank you curt

EChas3
09-05-12, 07:17 PM
Dark - That does seem on the low side of many members' reported mpg.

I may have exaggerated a bit but when you consider the cost of comparably-equipped cars, the cost of an STS leaves a lot of money for gas.

DarkMingBlueSTS
09-05-12, 07:30 PM
Yeah seems low to me too....I have an extremely light foot...I always get picked on about it :)

ddgm
09-05-12, 07:35 PM
Is that normal for that motor...that is really what the question meant

I get 25 to 27 mpg on my trips to and from Florida, about 1500 miles mostly running the speed limit. City driving is not good
Our cars (3.6L) have 3.42 gears which doesn't help any. I'm thinking of a diff switch. Have to do a little more research to see if it's worth it.

Doug

DarkMingBlueSTS
09-05-12, 07:38 PM
Wow...yeah I'm not even close to that Doug

caddyfat2
09-05-12, 07:47 PM
I have AWD with tires at 32psi and MRC. If I keep it at no faster than 65mph with almost all highway miles I can average 20.5 mpg on the tank. More spirited driving in the 75-80 range leads to about 17 mpg avg on the tank.
At 65 the rpm is about 1900 at 75-80 it's about 2100-2200. Not much rpm change but sure changes consumption.

that looks like a mirror of what my 05 AWD gets too.

cooncat
09-05-12, 08:23 PM
I have a friend who owns a 2000 Eldo and he averaged about 28 MPG driving from New York back home to Clearwater, Fl. There's something about those old front wheel drive cars compared to our rear wheel drive STS's.

DarkMingBlueSTS
09-05-12, 08:41 PM
I just looked mine up 17 city, 24 hwy I guess mine is "in the norm"

curtc
09-06-12, 12:56 PM
I have a friend who owns a 2000 Eldo and he averaged about 28 MPG driving from New York back home to Clearwater, Fl. There's something about those old front wheel drive cars compared to our rear wheel drive STS's.

If it isn't an ETC they have a different gear ratio...an old SLS will get the same on the highway...my 01 STS got about 22MPG highway

eatyoursandwich
09-06-12, 01:57 PM
I have a friend who owns a 2000 Eldo and he averaged about 28 MPG driving from New York back home to Clearwater, Fl. There's something about those old front wheel drive cars compared to our rear wheel drive STS's.

You answered your own question.

orange57
09-06-12, 09:15 PM
Orange57, where are you getting 25 - 28 MPG? How fast were you driving? The most I got doing about 70 to maybe 75 is 24 MPG. The northstars are gas pigs, especially around. Gas is not cheap these days. My local Shell station today was raised to $3.80. I don't consider that cheap. I don't even do that much driving.

We averaged in that range on a trip from Phoenix to San Diego. Right now, running the AC all the time, my short commute to and from work of 8 miles one way I get around 18ish MPG. In the winter, when I don't use the AC I get closer to the 20-21 MPG.

curtc
09-06-12, 09:33 PM
If your defrost is running the AC is on... :)

dkozloski
09-06-12, 10:34 PM
Mothballs and fingernail polish remover in the gas tank.

EChas3
09-06-12, 10:46 PM
Here, temps below 40F cost mileage; below 20F it's 20% or worse. Koz can tell horror stories.

Damn, that's ahead!

dkozloski
09-07-12, 11:28 AM
Before the engine warms up and switches to closed loop mixture control, the fuel air ratio is determined by a look-up table that is brutally rich at low to extreme-low temperatures. Think 8-12 MPG.

Submariner409
09-07-12, 01:57 PM
Someone threw the FWD cars in here, so........ My STS, running exclusively 87 octane Shell, gets 14 - 17 city, 16 - 18 suburban, 18 - 21 rural and 24.8 - 25.2 long-term Interstate (MD to FL) with 2 people, luggage, A/C, tires at 33 psi, cold. The final drive is 3.71:1 so the 279 C.I. engine turns 1985 rpm at 60, 2450 at 75. With Karen and I aboard the car weighs 4325#.

dkozloski
09-08-12, 02:14 PM
The bad news is that chips won't help you.

The good news is that we have lots of buffalo chips for the taking.

EChas3
09-08-12, 03:37 PM
Burn 'em & stay warm with privacy!

orange57
09-08-12, 08:46 PM
If your defrost is running the AC is on... :)

In AZ, winter lows may get down to the 30-40's occasionally. Most of the time the climate control is completely off once the hellish summers are over with :) I can't wait until Mid October/Early Nov when the temps start to drop below 100 for the highs.

EChas3
09-08-12, 10:20 PM
Actually, most modern cars cycle on the A/C during/after startup, even with the system off. The refrigerant lubricates the seals.

orange57
09-09-12, 01:13 AM
This makes sense. I've heard that by not running the AC can actually cause it to fail once the summer rolls back around. I'm pretty sure that is what cause the compressor to fail on my oldsmobile back in the day.