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Unfortunately... having been doing this for years... I have very little faith in the gas pump.
We once ran a comparison using a van for a tire manufacturer. Filled that sucker with gas. Let it settle. Filled it again. Shook it. Filled it again. Let it settle overnight. Filled it in the morning...
The best you can do with limited fills, I've found, is simply to do your first fill with the car in hot and running condition... do your run... and do your second fill in the exact same conditions. Ergo... do a run that you won't record. Fill the car. Do the run you will record. Fill it again. Still not 100% accurate, but more consistent.
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