gas mph 05 vs 08

[HummerMann]

I have to agree that mileage should not be a consideration if you're buying an H2. I've gotten as low as 8 and as high as 13 mpg and averaged 11.3 mpg over five years and 76,000 miles of owning two H2s.

[mikejr]

I am getting about 11.2 around town. Slightly better than my 06. I do have a heavier foot in the 08 since it sounds so damn nice when you get on it. My dad has an 08 also and lives in a rural area and gets upwards of 14 on his.

I will have to pull my manual but I could have sworn that it said hi octane was recommended. I run hi octane in my 08 since it simply runs alot better. Running regular it was sluggish and always hunting for gears. Hi test makes it run like a champ!

[lasvegash2]

in my 2008 h2 sut i tried to run 87 and 89 and it hesistate under wot...but with 91 it pulls really strong...the hummer dealership told me to run 91 oct in it when i bought it and now i know why

[CUZICAN]

I've run 87, 89, and 91 octane in my 08 and did notice perfomance differences with 87 but between 89 and 91 no big difference. Gas mileage had been right around 13 and up to 14 if doing a lot of 60mph driving out in rural areas.