pretty much the only thing that will help that is slowing down.... I had a suburban back in the day with 3.73 gears and 38" ground hawgs... it got about 11 mpg.... The auto O/D trans went bad on me and I drove it to work and back for a few weeks with only 1st and second... I drove it at 55 mph in 2nd gear and got 11 mpg ..... didn't matter if it was running 4000 rpm or 1600 rpm... same mileage
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