Ford Mustang Forum - View Single Post - 3.73 gears highway gas mileage loss?
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post #3 of (permalink) Old 03-09-2011
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You may see a slight reduction, maybe 1-2 mpg. As long as you take it easy on the highway and don't spend too much time over 75 it won't really be that big of a deal. You will probably lose more doing city driving because you will want to punch it more often

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