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Originally Posted by dbartromsut
Yep, my 08 does the same thing! It doesn't really sound like it is coming from the engine, so I don't see how running low octane fuel would make it do that. To me it sounds like its coming from the rear end... But mine does it and I do run 87 octane, so maybe. I'll try premium for a while and see what happens! You guys get way better mileage than me! I am lucky to get 10.5 mpg on the highway, but I would imagine that my tires, wheels and lead foot have to do with that!
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Wow........10.5 mpg.....I dont recall getting that low in my 08 or my 07 H2.
You should try switching to premium and see if you see a increase in miles per gallon. I have been on a trip in my 2008 and ran it 75--80mph and got 13.8mpg. The only thing I can think of is maybe its your tires where mine are factory and yours are oversized.........and then of course running on regular unleaded. For me, I can go more miles on a tank of premium than I can on a tank of regular. With the regular you may save a buck or two at the pump, but on mine, when hitting a hill, it downshifts and acts as if its starving for power. So the buck or two your saving at the pump, your just blowing it out your tailpipe.
Try running a few tanks of premium in it, and see if it improves.