Quote:
Originally Posted by Hersbird
I'm surprised you are having that much trouble hitting 20. My sister-in-law had a 4wd 5.3 Suburban we borrowed and even towing a large popup camper with 7 passengers we got 15. Then in a all interstate trip not towing at 70-75 it got 18. Does your 17 include a lot of in town? If not I would think about trying w/o the chip for awhile.
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I have the AWD model not a selectible 4wd system or even an Auto engage 4wd system. I am ALWAYS driving all 4 wheels. It does include a normal amount of city driving. All highway I was able to get 18.8 before my tune or aero mods. I haven't had a chance to run the same trip yet after the tune. The combined rating of 14 is pretty close to what I would expect most other people to get with my vehicle. I'm happy with anything over 17 on my day to day commute.
Quote:
Originally Posted by star_deceiver
Hitting 18 on the interstate is fairly easy, so long as the wind is in your favour. I've only hit 20mpg once, that was from puttering around Yellowstone at 45 mph for several days. The aerodynamics at high speed is a wall that you won't overcome in stock form.
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I think 20mpg on the interstae will be totally doable once I lower it 3 in the front and 5 in the back to bring the vehicle level and low. I will work on aero a little more with a bit of a belly pan to clean up the bottom some. But you're right there is only so much I can do before I hit an aero limit.