Re: This Just In... All 2008's must run PREMIUM!
Have the same slight rough idle at times as others have mentioned. Have been using Shell 87 since day one. Just filled up today and got 13.6 MPG, city driving, with 1050 miles on it.
On the highway, if I set the cruise to 65MPH, I can get a solid 16 - 17 MPG. Driving around rural roads at 40-45MPH and I have seen 18+ MPG.
Of course this is all with very conservative driving.
No knocks, pings or anything else for that matter.
Overall, I think this new engine / trans / gearing is great.
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 2008 H2 Graystone Metallic
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