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I could get 18-19 mpg going straight up with my 7.3 (3.73 gear ratio), as long as I kept the speed under 70 mph. As soon as I left the mountain 2 lane roads and pushed it up to 80 or so on the interstate, it would drop down into 12 mpg average in a hurry.
My 6.0 performs nearly the same with the same gear ratio, maybe about a 1 mpg less or so with the new fuel.
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