Re: 2008/2009 owners..... Premium fuel question??
I've filled my 08 w/regular 89 octane and had no issues.
I've tried using premium 93 octane...but I didn't notice any difference.
Then again, I never towed anything.
My Hummer dealer in Houston said it runs the same...w/regular as premium.
Who knows?! It could be preference or opinions...but I always tend to use regular.
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Don
2008 H2
Billy Boat Exhaust
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