As to filling. Irrelevant for most part. For consistency, same pump at same station parked same direction. Install into filler same way. Turn off at first click.
I wouldn't ever try to get as much fuel into tank as possible.
It's the average that matters.
Fun to try tank by tank, but unless one is running same highways as I was (commuting), we're hoping for a representative snapshot. Further tanks will prove the numbers.
Easiest fill method is best. Repeatability. Thus, earliest shutoff plus same pump.
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