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Before you start adding variables by testing different brands, at different pumps, at different stations, on different days and weeks. You might consider attempting to create something of a baseline of your real world conditions, with as few new variables as possible. Try to replicate the same result 3 or 4 times from the same pump, so you have some idea how much variation you will have tank to tank. Then when you goto the next pump, the ground willl be angled slightly different, the pump will click off at a different moment, so you really couldn’t compare fairly until your second tank from any given pump... I’m sure there’s more wrenches to be thrown in the gears, but as good as real world testing sounds, removing as many variables as possible makes it more likely to find actual results
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