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Discussion Starter #1
i was in my truck thinking if my spedo is off from my 38" nittos would my miles be off too? im going on spedo 55 friend next to me in car said i was going about 61-62 would my miles be off to go 50 miles in the truck would it be really like 75 miles or 60? i was wondering any help would be great
 

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Yes, your speed and tach are both going to be off. With a larger diameter tire it takes fewer revolutions to reach a set difference.
 

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Discussion Starter #4
so if i went 373 miles on a tank how many miles do you think im really going 400 420 440?
 
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