I have serious issues with the fill and refill method, but there really isn't any other choice unless you use fuel cells. If a competitor has air bubbles that get dislodged during the drive, that can affect their standings. You want to ensure everyone uses at least a few gallons for accuracy... but that would make for a very long run.
The slow fill method is a great idea, especially for cars with weird filler necks.
I'd say have a maximum time, measured out so that you have to average over the minimum speed limit to meet the time. Highway runs are most fun. City is challenging, but introduces an element of luck to the game. Maybe something rural, or with challenge sections where competitors have to deal with set stoplight sequences and stop signs and obstacles, to mix things up.
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