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Weights and measures are already regulated in the U.S. This is why, when you pay for a gallon of gas, you can be sure you are getting an actual, standard gallon of gasoline. This in itself doesn't seem to create a barrier to entry for gas stations and protects the consumer.

It seems to me that you can't be sure unless someone is auditing the weights or measures actually in use. Consumers can do a rough audit using their gas gauges, but it's not particularly precise.

In the US at least the state DOT's do go out and check on the pumps and check both that they are calibrated for liquid measure and that the gasoline falls within the acceptable temperature range (because warmer gasoline occupies a greater volume).

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