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Old 04-21-2013, 01:41 AM   #1
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Join Date: Apr 2013
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avg mpg calculation

I have entered 7 fuelups for my tdi diesel. I displayed total gallons used and calculated the mpg. 2553/81.02=31.5. I am using odometer so I subtracted the first fuelup 15.56=65.46. 2553/65.46=39.000. I still see an avg mpg of 55. How do you calculate the mpg? I know it will get better with more fuelups but I would like to know how you calculate it.

thanks
bob
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