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Old 12-11-2010, 10:13 PM   #13 (permalink)
SlideWRX
EcoModding Lurker
 
Join Date: Jun 2009
Location: SE Michigan
Posts: 66

Moostange - '07 Ford Mustang GT
Last 3: 21.8 mpg (US)
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Quote:
Originally Posted by tbobb View Post
what do i need to do to compensate for that? do you mean if my gauge says i am going 50, that i am really going 48.8? and if my last tank gave me 225 miles it is really less!? or do you mean something else?

Your last tank gave you 225 'indicated' miles, so actual mileage was ~230 miles. Speedo indicates 50 mph, actual is 51.2. That is assuming the speedo was accurate anyway... A GPS could tell you really quickly.
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