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  1. #11

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    My '09 is not as bad as yours (it does have the 6 speed tranny and 3.42 gears). A lot of city and a bit of highway will give me around 16 mpg (at least, that's what the DIC tells me).

    As I posted in an other thread a couple of days ago, I tried a speed test last week while driving in ME. 45 mph gave me the best mpg (around 25), 55 to 60 knocked it down a bit (I think it was around 20 mpg), driving at 75 knocked it down to 18. Speed makes a difference.

    I change the front O2 sensors when I change the plugs, because I've read that they start getting lazy around 80k, if this is true, or not, IDK.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  2. #12

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    Quote Originally Posted by RayVoy View Post
    My '09 is not as bad as yours (it does have the 6 speed tranny and 3.42 gears). A lot of city and a bit of highway will give me around 16 mpg (at least, that's what the DIC tells me).

    As I posted in an other thread a couple of days ago, I tried a speed test last week while driving in ME. 45 mph gave me the best mpg (around 25), 55 to 60 knocked it down a bit (I think it was around 20 mpg), driving at 75 knocked it down to 18. Speed makes a difference.

    I change the front O2 sensors when I change the plugs, because I've read that they start getting lazy around 80k, if this is true, or not, IDK.
    Thanks for the info! I would love to get mileage like that!

    - - - Updated - - -

    Took the truck to the dealer today. They said they checked everything and it all seemed fine. maybe the truck is just that bad on gas. oh well. I went ahead and changed the plug wires as well.
    -2008 Chevrolet Avalanche LT 4x4 w/ K&N CAI
    -2012 Kia Soul !
    -2003 Kawasaki Ninja ZX-6R 636

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