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Thread: Tune Up (Bad Gas Milage)

  1. #1
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    Tune Up (Bad Gas Milage)

    I Have a 2002 ext. I recently brought it in for the 30,000 service....lately i have been getting 10.9 to 11.1 miles per gallon driving in the city...(NYC)
    I was wondering if a tune up would help or should i get the K&N air filter to help me with my gas milage....besides when are we suppose to get a tune up on the escalades?
    thank you in advance


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  3. #2
    hcvone is offline Cadillac Owners 10000+ Posts
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    Re: Tune Up (Bad Gas Milage)

    I change my plugs every 20k miles, a bottle of Techron or injector cleaner every 5k will not hurt either. I get 12.2 in the city, no better or worse.

  4. #3
    slk230mb's Avatar
    slk230mb is offline Moderator
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    Re: Tune Up (Bad Gas Milage)

    Check the fuel filter. When I got my truck it had 43k on it and I was getting about 10-11mpg in NYC as well. I mentioned it to my service advisor when getting an oil change and he said he would check the fuel filter, sure enough it was clogged. Changed that and I started to get 13-14 in the city, 16+ on the highway depending on how lead my foot is...
    ~Steve

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    Re: Tune Up (Bad Gas Milage)

    thank you...i will check the fuel filter and also buy techron and use it....i just figured the 30,000 mile service would include the fuel filter...

  6. #5
    slk230mb's Avatar
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    Re: Tune Up (Bad Gas Milage)

    Quote Originally Posted by traxxxside2
    thank you...i will check the fuel filter and also buy techron and use it....i just figured the 30,000 mile service would include the fuel filter...
    It may, but I didn't perform my 30k checkup, my 60k one did however...
    ~Steve

  7. #6
    MEJIA's Avatar
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    Re: Tune Up (Bad Gas Milage)

    As said by everyone here, the fuel filter plays a big role in the fuel economy issue. Other than changing it constantly, installing a K&N air filter there is not much left to do to get better fuel economy from a 6.0L engine...

    Mejia

  8. #7
    Daryl in KY's Avatar
    Daryl in KY is offline Cadillac Owners Fanatic
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    Re: Tune Up (Bad Gas Milage)

    I replaced the plugs on my '00, 5.7L at about 55,000 miles. The old plugs looked really good, so I didn't notice any improvements in mpg.

    However, I usually notice an improvement when I chage oil. I use Redline & change every 9,000 to 10,000 miles. I don't think that the oil has lost its friction additives, but I suspect that in 10,000 miles the viscosity may have changed. I have seen other articles that document the viscosity chages of synthetic oil as the miles add up. This doesn't hurt the engine, but I suspect it affects the mph.

  9. #8
    pimp-cadi-danny's Avatar
    pimp-cadi-danny is offline Cadillac Owners Fanatic
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    Re: Tune Up (Bad Gas Milage)

    milege will vary.....how heavy is your foot? mine is very heavy lol

  10. #9
    Rolex's Avatar
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    Re: Tune Up (Bad Gas Milage)

    Swapping over to synthetic fluids may also help your mileage, albeit a small amount. You might give your engine a clean with Sea-Foam...one can in the gas tank and one can in the crankcase. It's the best engine cleaner on the market IMHO, and it may help a little (it certainly won't hurt).


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