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Cd my guess would be LOTS of tests and "average" the results to remove slight errors in runs.
might start with a fuel cell say 1 gallon. get up to speed and when your ready switch over to your 1 gallon fuel cell run till its dry.
that is your MPG. now repeat for consistent results and then make a change repeat several times average the results. switch back ie remove mod and do it again. average the results.
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