I have 4500mi on my H3 now and I can't seem to break about 13.5 mpg. Most of my driving is done on the hi-way usually crusing between 70-80mph, depending what the posted speed limit is. I have an automatic with 33in tires, I plan on changing the oil around 5000mi with mobil-1 synthetic hopefully this will help.
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What good is a Hummer if you don't use it.
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