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Old 03-29-2011, 08:36 AM
1FastS197 1FastS197 is offline
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Default Tire Revolution Help

hey guys, i was wondering if anyone knew how to figure how bad off my gas mileage is... i have a 01 Ranger 2.3L with a 5-speed auto trans... it had a 225/70 15 on it from the factory and now has a 205/70 15 on it... i'm trying to figure if the gas mileage would be worse or better than it is reading... i checked it and at 111.9 miles it used 4.195 gallons of gas, and thats 26.67 MPG... but i don't know how bad off this is... the 225/70 tire revolution is 761 RPM, and the 205/70 is 791 RPM... does anyone know if my gas mileage would be better or worse than what it is reading?
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Old 03-29-2011, 10:07 AM
zx6rrdan zx6rrdan is offline
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Default Re: Tire Revolution Help

http://www.miata.net/garage/tirecalc.html

By the tire size calc your speedo is reading 4% high so 4% too much mileage so gas mileage off by that amount. 26.7 becomes 25.7
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Old 03-29-2011, 11:01 AM
1FastS197 1FastS197 is offline
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Default Re: Tire Revolution Help

Quote:
Originally Posted by zx6rrdan View Post
http://www.miata.net/garage/tirecalc.html

By the tire size calc your speedo is reading 4% high so 4% too much mileage so gas mileage off by that amount. 26.7 becomes 25.7

ah! gotcha! big thanks to ya man!
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