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Originally Posted by HumbleAg
I think in a calculation this precise, you would need to factor in the evaporation coefficients for both the initial and subsequent fill ups, normalized for standard pressure and temperature. In addition, the varying load capacity due to Big Mac consumption and subsequent unloading would also cause variances.
Or you coud just say "screw it", I'm driving the cool truck that I want to drive and I don't really care about mileage.
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Not to be mean, but there should be no evaporation coefficient since it is a closed fuel system, what evaporates is burned when the carbon canister is purged by the canister purge solenoid. That is, as long as the fuel cap is still on.
As for varying load capacity...I don't eat when driving except at the end of the night, so my fuel mileage should get better with each rest stop.