I calculate mpg at every fillup based on the trip meter and gallons pumped, but it doesn't factor into how I drive the car. I just want to see trends over time.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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