So I was thinking about increasing the diameter of the tires on my 2012 Ford
Escape. Stock is 135 x 70 x 16 and in the forums, people are going up to 145
x75x16 for an inch more height along with H&R lifting springs which give
another inch. In as much as the final drive ratio has changed then the
speedometer is off.  Someone said that nowadays, you can get software that
will recalibrate the speedo as well as reprogram the power curve of the
engine to accomodate the change in your tire diameter that would help with
the slight decrease in gas mileage.  I have done performance flash before on
a VW gti but never thought about how you can recalibrate the speedometer
digitally. 

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