Poor Gas Mileage
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Poor Gas Mileage in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Hello, I have a problem. I have a 2004 Cadillac CTS (automatic - 3.6L V6) and it is terrible retaining ...
  1. #1
    established is offline Cadillac Owners Member
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    Poor Gas Mileage

    Hello,

    I have a problem. I have a 2004 Cadillac CTS (automatic - 3.6L V6) and it is terrible retaining gas. It only has 73k miles and runs pretty smooth. But idk what to replace that could possibly be the reason it burn so much gas. I put 93 premium gas. I really don't drive too much. I actually don't drive to work because I will definitely have to full up every 2 days. I just use the car to go to the mall or grocery store which is only a 15 minute drive. I don't drive fast which makes a car burn more gas. There is no message popping up that it needs maintenance. The engine oil is at 80% and the transmission oil is 58%. Idk if it's the fuel filter/pump, or it needs a full tune up judging by the oils percentage. I'm actually suppose to do an oil change at 75k miles. Any advice is appreciated!

    Thanks!

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  3. #2
    oxnard805's Avatar
    oxnard805 is offline Cadillac Owners Member
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    Need the same answer ! But for the 3.2

  4. #3
    Upchuck's Avatar
    Upchuck is offline Banned
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    It only requires 87 octane. Using 93 could be your problem, try running 87 and see if it improves

    ----------

    I also just changed the plugs and the emission purge valve solenoid also. My gas mileage sucked, went to about 18 hwy before I replaced them, now I'm back to where it should be. Some of the real cts gurus on here should be able to point you in the right direction

  5. #4
    Kingoftypos is offline Cadillac Owners Master
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    Gotta love the "my mpg sucks" but no actual numbers. Just times to a place.

    What are your actual mpg numbers? Just to clarify, the 2.8 and 3.6 require 87 grade while the 2.6 and 3.2 require 89. So stick with those grades for your engine and you shall be fine. Anything above them, your wasting money. Except to do a fuel system cleaning or what not. But not to be done on every tank of gas.

    I personally receive about 18 to 20 mpg on my 2.8. Here in New England, there are tons of hills. I live less than 4 miles to work. Probably 10 hills to work.

    When ever I travel to south of New Jersey. My mpg goes up to 22 to 24 for that time. Because there aren't as many hills.

    KOT
    Tlorenzen and Tlorenzen like this.

  6. #5
    CTS414 is offline Cadillac Owners Fanatic
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    Re: Poor Gas Mileage

    I have an '04 3.6L and I'm usually in the 19-20mpg range all around. I only use 87 Octane as that's what it's made to take.

    I drive aggressively, but not too crazy. By keeping an eye on the instant econ readout you can see where the car likes to sit for best mileage.

    These cars don't get great gas mileage it is what it is: http://www.fueleconomy.gov/feg/bymod...llac_CTS.shtml

  7. #6
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    Fuel injection cleaning, a new fuel filter, air filter, and possibility spark plugs, but at 75k you should be good.

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    Caddy Dad's Avatar
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    Re: Poor Gas Mileage

    Damn.. I've been buying 93 octane all this time for nothing?! Could have save about 35cent per gallon had I known this. I'll drop to 89 and see if anything happens first.

  9. #8
    aviatordave is offline Cadillac Owners Fanatic
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    Re: Poor Gas Mileage

    when in doubt - read the owner's manual
    Kad4Life, Kad4Life, CTS414 and 4 others like this.

  10. #9
    DopeEffect's Avatar
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    Re: Poor Gas Mileage

    I have a 2006 3.6L and I get on average, 22/23mpg. Every time I fill it up, I clear the mpg counter on the DIC and check the mileage on my trip a & b (for those of us that like doing the math). Once or twice a month, I will run a can of seafoam in my fuel tank to help keep my injectors clean. I only use 87 octane gas. My current mileage is 106,800 and the only thing really wrong with my car (at the moment) is timing chain slack and a worn rear diff bushing. I drive 48 miles a day to and from work.
    I live in the southern dallas texas area and drive in all kinds of terrain/traffic (hills, dirt/gravel, flat, stop n go, highway/freeway). I've owned the car since July of 2012.

  11. #10
    established is offline Cadillac Owners Member
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    Re: Poor Gas Mileage

    Hey everyone. Thanks for your responses. I bought a computer and it gave me a p0469 code. When I say it burns a tremendous amount of gas, I mean I can drive 2 blocks and the gas meter will drop significantly. Its reading the gas wrong as well. I put half a tank of 89 on Sunday evening. As I was going to work, the meter drop to the second line before empty tank. Do anyone have any idea how much this small leak will cost the fix? I checked the gas cap and its tighten. My car idles and idk if its because of the leak or the motor mounts are going bad.

  12. #11
    salcuta88 is offline Cadillac Owners Member
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    Re: Poor Gas Mileage

    Did you ever run out of gas? The gauge seems to move from half to 1/4" in a matter of minutes. No biggie though. Also, don't rely on the computer oil reading. Change your oil on time and check it every 2 weeks or so.

    In addition, it could be your O2 Sensor.

  13. #12
    Kingoftypos is offline Cadillac Owners Master
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    Re: Poor Gas Mileage

    Quote Originally Posted by established View Post
    Hey everyone. Thanks for your responses. I bought a computer and it gave me a p0469 code. When I say it burns a tremendous amount of gas, I mean I can drive 2 blocks and the gas meter will drop significantly. Its reading the gas wrong as well. I put half a tank of 89 on Sunday evening. As I was going to work, the meter drop to the second line before empty tank. Do anyone have any idea how much this small leak will cost the fix? I checked the gas cap and its tighten. My car idles and idk if its because of the leak or the motor mounts are going bad.
    Change the purge vent solenoid. It's less than $50, probably even from the dealer at this point, and a 5 minute job with basic tools.

    KOT

  14. #13
    djkdawg's Avatar
    djkdawg is offline Cadillac Owners Fanatic
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    Quote Originally Posted by DopeEffect View Post
    I have an 2006 3.6L and I get on average, 22/23mpg. Every time I fill it up, I clear the mpg counter on the DIC and check the mileage on my trip a & b (for those of us that like doing the math). Once or twice a month, I will run a can of seafoam in my fuel tank to help keep my injectors clean. I only use 87 octane gas. My current mileage is 106,800 and the only thing really wrong with my car (at the moment) is timing chain slack and a worn rear diff bushing. I drive 48 miles a day to and from work.
    I live in the southern dallas texas area and drive in all kinds of terrain/traffic (hills, dirt/gravel, flat, stop n go, highway/freeway). I've owned the car since July of 2012.
    You forgot to say it gets hot as hell and its always humid

    Southern dallas, were are you in cedar hill or desoto ? I pretty much drive from las colinas to desoto to drop my kid off at my moms and from desoto to downtown dallas for work! Dallas is huge so I do about 80 to 100 miles per day in my cadi and she runs like a beast, and have the same problems you have. But I get 23 mpg and I am happy with that since I came from and 01 sts and an 04 deville, they were getting me about 16 to 18 mpg and took premium only , if I wanted better gas mileage I would have went with the trusty hondas but I went for looks and performance, its worth it to me. So I think my cts gas mileage is awesome!

  15. #14
    established is offline Cadillac Owners Member
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    Re: Poor Gas Mileage

    Yes I run out of gas. Actually a few minutes ago, it went empty and I put half a tank of 87 like one poster suggested.

    ----------

    Thanks. I will get that looked after and give an update. A mechanic told me it could be the canister.

  16. #15
    DopeEffect's Avatar
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    Re: Poor Gas Mileage

    Quote Originally Posted by djkdawg View Post
    You forgot to say it gets hot as hell and its always humid

    Southern dallas, were are you in cedar hill or desoto ? I pretty much drive from las colinas to desoto to drop my kid off at my moms and from desoto to downtown dallas for work! Dallas is huge so I do about 80 to 100 miles per day in my cadi and she runs like a beast, and have the same problems you have. But I get 23 mpg and I am happy with that since I came from and 01 sts and an 04 deville, they were getting me about 16 to 18 mpg and took premium only , if I wanted better gas mileage I would have went with the trusty hondas but I went for looks and performance, its worth it to me. So I think my cts gas mileage is awesome!
    Lol it's always either hot or humid... or both. Normally both. But yes, I drive through that area quite a bit. Desoto, Cedar Hill, Duncanville, Lancaster, Ovilla, Red Oak, and the Arlington/Irving Area for work.
    If you ever see a Stealth Gray CTS with a blacked out V grille and the stock grandma wheels, it's me lol. But yes, I am very happy with my gas mileage. When I was looking for cars last year,
    it came down to the cts, honda accord coupe, and an impala ss. Technically, I should of gone with the impala but, they wanted to much and it required to much work. Glad I went with the caddy just wish it was easier to work on.

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