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2008-2013 Cadillac CTS General Discussion Discussion, 2013 CTS4 Coupe AWD awful gas mileage in Cadillac CTS Second Generation Forum - 2008-2013; Originally Posted by tinman B.S. You are employed by a company that is employed by Cadillac, just like myself and ...
  1. #46
    jeffc83's Avatar
    jeffc83 is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by tinman View Post

    B.S. You are employed by a company that is employed by Cadillac, just like myself and the rest of us who actually post good things about our cars.
    Lol...good one!

  2. #47
    Sal33n's Avatar
    Sal33n is offline Cadillac Owners Fanatic
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    Quote Originally Posted by Ramv View Post
    You will get worse gas mileage on premium. It has a lower detonation temperature. Terrible waste of money unless you do a tune requiring premium.
    I think you have it backwards. The Higher the Octane, the more resistant it is to detonation.

  3. #48
    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    Resistant = slower, you're right, Sal33n

  4. #49
    snofun3 is offline Cadillac Owners Fanatic
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    Quote Originally Posted by Ramv View Post
    You will get worse gas mileage on premium. It has a lower detonation temperature. Terrible waste of money unless you do a tune requiring premium.

    Now if you need premium to avoid detonation with a tune or forced induction upgrade that would make sense but in a a FI car designed for regular higher octane gas will lower gas mileage and power.



    ----------

    4200 lb car, AWD and a very high drag coefficient. 20 mpg is pretty reasonable. I have seen 24 once. Mainly 20-21. 11 if I drive it hard, or high teens with typical American "highways" driving. Why would would think anything other ? My golf which weighs 2k lb has a better cd, and 130 hp gets 30. Sure as hell not goi g to be close with a car twice as big.

    How the interweb becomes great source of bad and misleading information.

    Higher octane gas has a higher detonation temperature, which is why it's used with higher compression engines to avoid pre-ignition, or exploding too fast in the combustion chamber.

    D'uh!

  5. #50
    Ramv is offline Cadillac Owners Fanatic
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    Sorry, misspoke. Yes, it has a higher ignition temperature leading towards less detonation. Less power, less mileage, if you aren't tuned and have the compression for it.

    Still the same point. Don't run premium if you don't need it.

  6. #51
    JBsZ06 is offline Cadillac Owners Enthusiast
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    18.7 mile per gallon over 44k miles where we never reset the mpg ......driven around town by my wife.

    2008 cts 3.6 direct injection AWD fe2

    Been utterly reliable and a beautiful car.

    Nth

  7. #52
    rustybear3's Avatar
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    Bottom line: CTS Coupe was NEVER advertised to be an economy based car. It's more of a sports car version of the standard CTS. 20 MPH or a little less is actually pretty good for a car in this size range and Engine. sheeeesh!

  8. #53
    C "T" ess's Avatar
    C "T" ess is offline Cadillac Owners Connoisseur
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    I obviously didn't purchase based of fuel mileage. This is my fourth CTS and I get what I get. I can't remember ever buying a car since they began rating them, that has actually gotten the advertised gas mileage. I don't think the standard for testing set by the EPA are the problem. I don't think they are real world realistic. This leads buyers left to question whether it's just their car or all of them. I agree with some of the posters who diligently check their mileage that the numbers are low by any standard. I don't think any two cars are the same just like no two drivers the same, combine this with unrealistic expectations based on government numbers equals a lot of heartburn. Just my $0.02 worth.

  9. #54
    gohawks63's Avatar
    gohawks63 is online now Cadillac Owners Connoisseur
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    Quote Originally Posted by rustybear3
    Bottom line: CTS Coupe was NEVER advertised to be an economy based car. It's more of a sports car version of the standard CTS. 20 MPH or a little less is actually pretty good for a car in this size range and Engine. sheeeesh!
    I agree. My OnStar app has said I have a lifetime average of 21 mpg over 16,000 miles.

  10. #55
    EVH5150's Avatar
    EVH5150 is offline Cadillac Owners Fanatic
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    Re: 2013 CTS4 Coupe AWD awful gas mileage

    Quote Originally Posted by gohawks63 View Post
    I agree. My OnStar app has said I have a lifetime average of 21 mpg over 16,000 miles.
    That's not too bad my friend. I think most people would be happy with an average above 20 MPG.

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