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1987 - 1996 F150 & Larger F-Series Trucks
mileage question...

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

mileage question...

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Old

Feb 27, 2011 | 03:03 PM

#1

stupidcosmoline

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mileage question...

hey i have a 91 150 300 L6 with 3.08 gears. thinking of putting 31's under it. does anyone have any experience with the mpg changes? how much should i expect to lose?

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Mar 6, 2011 | 05:46 PM

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Boss94

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From: Northern Illinois

I get about 16 high way on a good day.

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Mar 7, 2011 | 03:52 AM

#3

TexasGuy001

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The 31s shouldn't hurt your fuel economy very much. They didn't really effect mine. If they did it was 1 mpg. Something else to consider is that your speedometer will be off a little bit, so to get accurate MPG figures you need to setup it up for 31s by changing the speedo gear which is pretty cheap and easy to do.

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