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Hi Tbird1983,
If you drive the same number of miles and get the same average MPG, then you've hauled the same weight of fuel, whether you carried it all from the start of stopped for gas every mile.
Carrying more weight does use more gas, but it's probably linear - I mean if 100 lbs lowers your car's MPG by 1 then 200 lbs would lower it by 2. Roughly speaking.
-mort
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