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Old 08-05-2019, 08:06 PM   #18 (permalink)
Master EcoModder
Join Date: May 2010
Location: Illinois
Posts: 452

Oh Deer - '03 Ford Ranger XL
90 day: 33.16 mpg (US)
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Is it tire circumference of revolutions per mile? I would think they would be the same (as a percentage) but when I put my stock size and new size into a calculator I got slightly differing percentages.

I usually go with a flat 5%. I add 5 miles for every 100 I drive or 1 mile for every 20. I'm not sure .3% makes a huge difference, but if you want absolute accuracy which one would you use?

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