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Old 01-20-2013, 05:57 PM   #6 (permalink)
EcoModding Lurker
Join Date: Aug 2009
Location: Hamburg, New York
Posts: 95

Samantha - '94 Ford Ranger XL
90 day: 14.04 mpg (US)

Cassidy - '12 Chevrolet Silverado W/T 4x4
90 day: 12.6 mpg (US)

Mustang - '06 Ford Mustang Convertible GT
90 day: 17.42 mpg (US)
Thanks: 3
Thanked 6 Times in 5 Posts
You might be seeing better gains than you think. You gotta find out the difference in circumfrence, not o.d. I put 225/75-15's on my ranger instead of 225/70-14's and those are under 2 inches taller. Go to a tire size calculator (just google search it) and enter your stock size and the new size and it will tell you what percentage it throws off your speedometer (and therefore your odometer). In my case that less than 2 inch o.d. Was worth 7.11%, so now when I enter my mileage I multiply the odometer reading by 1.0711 and get actual miles driven
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