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I get 7-8 MPG on the Hwy, 4-5 in city driving. The only way to increase it was to slow down on the highway. Then I might get 9-9.5 MPG. But, then all the big trucks would zoom by, the air from that is a little scary. I did not find it was worth it to slow down. Unless you take the side roads, which I have done at times. More to see sometimes that way. And if I was in a hurry, I would not use the RV. Because I want to see things along the way.
I have an older Chevy based Class C, w/5.7 L V8 & 3 speed trans.
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