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Archive for March 2nd, 2006
Two Questions on Fuel Economy and Tire Size
Posted by Tim on March 2, 2006
Q1 If I switch from 11R22.5 to LP22.5 size tires, what will the fuel saving would be?
Q2 Which tire size gives you better MPG, 11R22.5 or 11R24.5? Why?
Both of these questions refer to changing tire sizes and the resulting affect on fuel economy. In both cases, we must assume that the "tall" tire and the "short" tire have a similar tread compound. In each case, switching to a tire with a smaller diameter can improve the fuel economy of a vehicle by 1) lowering the vehicle which will reduce the aerodynamic drag and 2)reducing the total weight of the tires and wheels on the vehicle. But, in order for the engine to turn over the same RPM's at any particular road speed, the final drive ratio must be adjusted for the smaller diameter tires. Failure to adjust the gearing will give you a false indication of savings (the odometer will say the vehicle has gone more miles that it really has gone) and the higher engine RPM (at the same speed) will actually burn more fuel than before.