^^^^ what jkv357 said. Holding a fuel efficiency competition with no real control over the amount of fuel people are using is senseless. You may as well just let people guess what their mileage was and use those numbers to decide who wins.
Controlling things with various vehicles all using different fuel tanks may be a bit of a chore.
With flow meters on each vehicle you'd have to make sure they are all calibrated to give the same numbers, and you'd also have to figure out how to mount/power them on the different vehicles.
What might work best would be to have everyone start with a dry tank. Have the officials put a measured amount (it wouldn't need to be the same amount if tank capacities vary) in every tank using accurate measuring devices. At the end of the course drain and measure the contents of each tank to see how much was used.
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