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Old 09-04-2012, 06:43 PM   #1 (permalink)
Dcarver
EcoModding Lurker
 
Join Date: Aug 2012
Location: Texas
Posts: 9

Opposite of white lightning - '98 Ford F150 Ext cab lariat
90 day: 16.94 mpg (US)
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Tires/Gear Ratio/MPG

Hey y'all I've got a confusing (to me anyway) question. I'm looking to downsize my tires from 275/60/17 to probably 255/60/17. I figure this will effectively up my gear ratio from 3.55 to around 3.73ish. I know my lower gears are better for mpg and I love that, but I'd like to be able to tow better and with having 3.73 gears I would probably have better mpg while towing anyway. Now with smaller tires shouldn't I have less energy to rotate the tires effectively upping my mpg?

Please help me figure this out. I obviously don't want to change my gears as in mechanically swapping them and since I need new tires anyway, I just thought I could kill two birds with one stone.

thanks,
DC

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1999 Chevy Tahoe
2wd 3.42 gears
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