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Fuzzy math?
Posted by Noel [Email] (more from Noel) on Thu, 7 Oct 2010 06:45:38
In Reply to: If it makes their tires appear having better mpg, Time, Wed, 6 Oct 2010 15:20:53
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You're right, go to Tire Rack and the specs come up showing around 823 revs/mile for this size tire. I looked at Dunlops, Bridgestones, Contis, and Michelins, and all list the same diameter.
The diameter of a 215/55 x 16 is 25.3" and the circumference is 79.5"
According to the Miata Tire calculator, this is 797 revolutions per mile. Makes sense: 5280 ft x 12" = 63,360"/79.5" = 797 revs/mile.
But the relationship between tire revs per mile and fuel mileage is a bit sketchy. The size of the contact patch and rolling resistance are much bigger factors. And no one but car guys read those specs anyway, so why would it matter to the tire companies and car makers?
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