Quote:
Originally Posted by bwilson4web
This makes it even better: 165/70R13 - 0,937 lbs - 51 psi - 949 rev/mile - $54/ea
175/70R13 - 1,036 lbs - 51 psi - 927 rev/mile - $52/ea - -2.32%
185/70R13 - 1,135 lbs - 51 psi - 907 rev/mile - $60/ea - -4.23% If the 185/70R13 fits, there is potentially a 4% reduction in engine rpm.
Bob Wilson |
So at a steady speed comparison between the current 165s and a new set of 185s, with a 4.23% reduction in RPM, you might get an improvement of 2+mpg (again, assuming a consistent highway speed comparison of the tires). To minimize possible increased aero drag you could build tire spats for front and back tires. To minimize the small weight increase you could find a little weight in the car to remove.
Oh! and if these LRR tires are replacing high RR tires, the benefit should be much greater than 2mpg.