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Originally Posted by PhilD
Simple, you measure the distance between the closest points of the tire edges with stock tires, then measure again with the larger tires. Divide by Pi, then X2. you then need to move the rear axle back that amount  |
No Phil, it's divide by Pi squared, not x2. sorry to have to correct you on that.
Once the axel is moved back by that amount your mileage should double back to 11 mpg.