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Originally Posted by guruerror
Mark: Losing that 3mpg put you at what for your average?
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I drove to Alabama this weekend from NC (roughly 500 miles) For "the most part", I had the cruise control set of 78-80 pulling an open car trailer with 4 people in the Hummer.
On the way back, I also had a 1200lb. UTV on the trailer.
I only averaged 12mpg running at those speeds. I'm also using the second to top tune (which actually gives me a couple of miles per gallon better results)
With the 37's (which actually measure 35 or 36" tall) with the top tune and no trailer, I was getting 17-18 with the cruise set on 82-84.
Lower tune, bigger tires and trailer and lower speed gave me less mpg.
Mark