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Old 04-21-2013, 12:31 PM   #17
Wheel Man
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Drives: 1 of 70 '13 GXH 2SS RS 1LE NPP NAV
Join Date: Feb 2013
Location: Parrish, Florida
Posts: 957
GM gets their numbers with all fluids full. So at 6.25lbs a gallon you are down around 80lbs in fuel so add that to 3820 and you get 3900 which seems about right.
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