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Archive for March 1st, 2007
Tire Fuel Economy with Larger Tires
Posted by Chris from Bennett, CO, US on March 1, 2007
I have a 2001 Ford F350 Dually 4x4 Auto Powerstroke. I am currently getting 13mpg with most driving on the highway 75mph. I was speaking with my buddy who recommended I go from 235/85R16 tires to 265/85R16 or 285/85R16, basically a taller tire. I am curious if this would improve my fuel milage and if if would be signifigant. I think I have the 4.11 rear end. I was told my power off the line will be effected but my top end on the interstate will be better. I am curious if this sounds right and if I could expect other problems with this type of change.
With all other things being equal, a taller tire is better for fuel economy and a wider tire is worse. Going from the 235/85R16 to either of the other two tires gets you a taller, wider tire so, my guess is that the fuel economy difference will be too small to measure. Other issues... the change in diameter will affect your gearing, speedometer and odometer all of which affect how the fuel usage is calculated.