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i have 275/55/20's ang get 12.5 mpgs avarage, i know thats its probably not 100% accurate cuz the wheels size. How much am i really getting ? i saw a chart here somewhere to calculate it but cant find it.
 

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Take the difference in overall diameter, yours is about 1.3 inches taller, and divide by the oem diameter and you get about 4.25% difference. Your odometer is reading 4.25% fewer miles than actual due to the larger diameter tire.(31.91-30.61)/ 30.61. Then convert to a percentage by multiplying by 100, then round off.(4.2469 to 4.25).
 
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