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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