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post #10 of (permalink) Old 07-29-2019, 03:21 PM
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I wanted the 4.30 so got an F450. A 4.10 may get better mileage, but not by much. A higher ratio like the 4.10 or 4.30 will let you get a load going with less strain on the engine and transmission and may even get better fuel mileage except for long, long highway miles on level ground. If you're doing any stop and go, and I don't mean constant stop and go like city driving but every few miles going through small towns, or going anywhere but level ground you'll appreciate the lower ratio and won't suffer meaningful differences in mpg.
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