Anyone have any tips on mods to improve gas mileage??
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2008-2013 Cadillac CTS Performance Mods Discussion, Anyone have any tips on mods to improve gas mileage?? in Cadillac CTS Second Generation Forum - 2008-2013; I get about 16 mpg which i think is average. About 275 miles to a full tank. But i just ...
  1. #1
    LuciousLAC is offline Cadillac Owners Member
    Automobile(s): 2008 CTS 3.6 DI
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    Anyone have any tips on mods to improve gas mileage??

    I get about 16 mpg which i think is average. About 275 miles to a full tank. But i just feel like im gassing up a lil too much. with gas at $3. 60 a gallon i wanted to know is there any mods to improve this?

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  3. #2
    MoFex's Avatar
    MoFex is online now Cadillac Owners Connoisseur
    Automobile(s): 08 White Diamond CTS DI RWD FE2 all options
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    Re: Anyone have any tips on mods to improve gas mileage??

    Sorry to disapoint you but there is nothing you can "modify" except your driving habits.....I am getting 20 mpg suburbia driving and 25 - 28 mpg on the highway. However, when I push it a bit harder the gas milage suffers....it is simply physics at work....

  4. #3
    LuciousLAC is offline Cadillac Owners Member
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    Re: Anyone have any tips on mods to improve gas mileage??

    I see u are in atlanta so i guess u really feel my pain. im in augusta. ahh well i guess thats the tradeoff for having a 3.6 DI!

    i still love my purchase!

  5. #4
    kingtj is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    Yeah... Even when I'm driving a fair bit of highway miles (to and from work, etc.), and not driving aggressively at all around town, my combined mileage never seems to get above around 17-18MPG, at best.

    (I'm driving the 2011 CTS Coupe AWD.) If the "instant mileage" readout on the DIC is to be believed at all, it looks like the *only* way to get decent mileage in this vehicle is to coast as long and often as possible. As soon as you press the accelerator down at all, the instant mileage drops like a rock, to as little as 3-4MPG!

    Bottom line is that this is a very heavy car, so mileage just isn't going to be too impressive. Personally, I think the EPA highway estimated mileage numbers they published are suspect too, but maybe I'd actually see those in the right conditions, on a LONG highway drive using cruise control....

    Truthfully, if I knew the gas mileage on these was quite this low on average, I might have been more motivated to find a used CTS-V Coupe. I'd love to have the V, except I feared car insurance would be sky-high, AND the mileage those guys were reporting (around 14MPG?) put me off as well.

    Quote Originally Posted by LuciousLAC View Post
    I get about 16 mpg which i think is average. About 275 miles to a full tank. But i just feel like im gassing up a lil too much. with gas at $3. 60 a gallon i wanted to know is there any mods to improve this?

  6. #5
    MoFex's Avatar
    MoFex is online now Cadillac Owners Connoisseur
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    Re: Anyone have any tips on mods to improve gas mileage??

    I drove several times to Florida, always on the same interstate, similar speeds an dguess what? The fuel economy was anywhere between 24 mpg - 28 mpg. The largest influence was the wind. During my second last trip I go 28 mpg arriving in Tampa, last one - 24 mpg arriving in Fort Myers. The difference? During last trip we were going against head wind, that gusted up to 30 mph.....

    So I do believe in EPA hwy ratings.....

    And yes, this is the price we are payng for luxury (car weight) and performance - 3004HP

  7. #6
    Wag-O-Neer is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    Just this weekend, I got the car up to speed on the highway, set cruise to 69MPH, and zeroed the MPG indicator. After 33 miles of unimpeded driving, I was getting 20MPG. They lie....

  8. #7
    jimtreber is offline Cadillac Owners Member
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    Re: Anyone have any tips on mods to improve gas mileage??

    I, too was disappointed in the mileage on my 2008 CTS DI AWD. I traded in a DeVille Northstar that easily got better mpg.
    Last week I bought an Airaid cold air intake package that included the throttle body spacer. I originnaly scoffed at the spacer ads about increase torque and mpg even after reading tesamonials. 4 days ago I installed the spacer only, saving the intake system for another day. It took me about 10 minutes to install.
    I am now a believer. I could feel the difference the minute I left the driveway. I've been watching the average mpg closely and my driving consists of city and suburban driving My mpg increased over 3 mpg on a 4 day average. I have yet to make a hiway run. Unless there was something wrong with my car to make this difference, this thing works for me. I hope there is no downside.

  9. #8
    00 ss is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    Mine averages just under 22 mpg in my normal commute. It's a 100% stock 08 AWD DI car. I'll be taking a long driving trip (900+ miles each way) starting Thursday so by next week I should know what the true highway mileage is. I'm hoping to see 25+ but I'm not holding my breath.

    Tell me more about this Airaid product. Do you have any pics?

    Edit:

    I went and found the Airiad product on their website. They state that the increased air velocity improves fuel atomization. This has some chance of working on a standard fuel injected engine, and even more of a chance on a throttle body injection system or a carburetor. But in the DI engine, air velocity has no effect on the fuel atomization since fuel and air don't mix until it's already in the combustion chamber. The unit for the 3.6 also appears to extend into the throttle body. I can see this increasing air velocity by reducing the area of the opening out of the throttle body. This may indeed produce better off idle response, but it will likely hurt higher RPM performance.

    Jimtreber, it appear you have been using this product for about a week. Please let us know if your gains appear to be sustained after you've used it for a few weeks or months. It may be possible that your increase in MPG is actually due to you watching the monitor and unconsciously altering your driving style and not from this product. Then again, maybe it actually works and there is some bit of physics and thermochemistry I'm overlooking.

  10. #9
    Mano4 is offline Cadillac Owners Member
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    Re: Anyone have any tips on mods to improve gas mileage??

    I currently installed the Injen Cold Air Intake and have had it for about 3 weeks now, it has increased my fuel economy by a quarter of a tank, and I mostly do city driving.

  11. #10
    00 ss is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    So you're saying you got 25% better fuel economy by installing a new intake tube and cone (or cylinder) shaped filter located down lower? That would be an increase of about 3-5 mpg in the city. If you can sustain that for extended period of time, that would be truely amazing. I hope you can. Would you mind resetting your average fuel economy setting on computer and report back on your average MPG after a couple more tanks?

  12. #11
    LuciousLAC is offline Cadillac Owners Member
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    Re: Anyone have any tips on mods to improve gas mileage??

    Quote Originally Posted by Mano4 View Post
    I currently installed the Injen Cold Air Intake and have had it for about 3 weeks now, it has increased my fuel economy by a quarter of a tank, and I mostly do city driving.


    Well so far i hear mostly that a cold air intake is the best way to go to improve gas mileage. HAs anyone ever heard of those gas saver things the sell on ebay. something about they use negative ions on the gas and make your mileage better.

    Any truth to that?

  13. #12
    00 ss is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    I've heard of them, but I've never met anyone who could substantiate the claims. I am very skeptical of them.

  14. #13
    jimtreber is offline Cadillac Owners Member
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    Re: Anyone have any tips on mods to improve gas mileage??

    Quote Originally Posted by 00 ss View Post
    Mine averages just under 22 mpg in my normal commute. It's a 100% stock 08 AWD DI car. I'll be taking a long driving trip (900+ miles each way) starting Thursday so by next week I should know what the true highway mileage is. I'm hoping to see 25+ but I'm not holding my breath.

    Tell me more about this Airaid product. Do you have any pics?

    Edit:

    I went and found the Airiad product on their website. They state that the increased air velocity improves fuel atomization. This has some chance of working on a standard fuel injected engine, and even more of a chance on a throttle body injection system or a carburetor. But in the DI engine, air velocity has no effect on the fuel atomization since fuel and air don't mix until it's already in the combustion chamber. The unit for the 3.6 also appears to extend into the throttle body. I can see this increasing air velocity by reducing the area of the opening out of the throttle body. This may indeed produce better off idle response, but it will likely hurt higher RPM performance.

    Jimtreber, it appear you have been using this product for about a week. Please let us know if your gains appear to be sustained after you've used it for a few weeks or months. It may be possible that your increase in MPG is actually due to you watching the monitor and unconsciously altering your driving style and not from this product. Then again, maybe it actually works and there is some bit of physics and thermochemistry I'm overlooking.
    I totally agree with you and even hesitated to rush a post here before the true facts and certainly do not want to misslead anyone. But the difference was dramatic enough to speak up. Feeling the difference in the go pedal did make me wonder if it was in my head. Before the spacer I have been trying to ease my mpg dissapointment by driving this car in a way trying to get the most mileage so I know what it will max out at with me behind the wheel. While I feel that it takes less pedal to do the job now(or may be my imagination), I may now be driving it even a bit harder because it seems to pull better at light throttle. Before I install the cold air package, I want to do a few hundred miles on the interstate and see what happens there. Like I said earlier, for all I know there possibly could be a problem with my car accenting these results. But it's making me happy.

    ----------


  15. #14
    00 ss is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    Well that's awsome. What mpg were you at and where are you now? When you get a chance, I'd be very interested to know if the increase carries over to the highway.

    It sounds to like you were as skeptical as I am before you tried it. It's still hard for me understand how such a simple thing could do so much and NOT be included from the factory. You would think that the factory would WANT to install something like this if works that well.

  16. #15
    WRXtranceformed is offline Cadillac Owners Fanatic
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    Re: Anyone have any tips on mods to improve gas mileage??

    Another easy "free" mod you can do is to not carry around a lot of extra weight in your car. Don't leave stuff in your trunk, remove engine covers / hood heat shield, remove the spare tire and replace it with fix a flat, etc.

    Other than that, driving style is a big one and keeping up on your maintenance is another.

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