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Old 06-05-2008, 10:58 AM   #5 (permalink)
Join Date: May 2008
Location: Alexandria, MN
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Volt12 - '12 Chevy Volt base
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However it does slightly depend on your cars engine some are very in efficient at lower revs.. some are more efficient in lower revs.. but yes generally the slower you can get the RPMs for any given speed the better MPG you'll get as each RPM your pulling in a set amount of air and fuel into the cars engine..

The nice thing about tirew sizes are you can experiment pretty easily and cheaply.. no re gearing the transmission etc.. just swap out the tires, and you could even just do the drive tires if you didn't want to invest in a whole set.. at least initially.

However taller tires will raise the car that may be a consideration.. and your speedo will be off.. however a gps can tell you how far its off and you can then remember that 55mph on the speedo is actually 60 or whatever the gps gives you..

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