JH>So I was thinking about increasing the diameter of the tires on my 2012 Ford   
   JH>Escape. Stock is 135 x 70 x 16 and in the forums, people are going up to 145   
   JH>x75x16 for an inch more height along with H&R lifting springs which give   
   JH>another inch. In as much as the final drive ratio has changed then the   
   JH>speedometer is off.  Someone said that nowadays, you can get software that   
   JH>will recalibrate the speedo as well as reprogram the power curve of the   
   JH>engine to accomodate the change in your tire diameter that would help with   
   JH>the slight decrease in gas mileage.  I have done performance flash before on   
   JH>a VW gti but never thought about how you can recalibrate the speedometer   
   JH>digitally.   
      
   IF you have a recalibratable Electronic Speedometer check out this web   
   site.   
      
   http://www.autometer.com/tech_faq_answer.aspx?sid=2&qid=40   
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