I believe in California they don't rebabte the taxes, but people who use it for farming equitment buy special gas that does not include the taxes. The state requires the gas to be colored red from what I hear, so the state can do spot checks to see if the farmers are cheating by putting the gas in highway vehicles, like delivery trucks etc. It's a pretty steep fine if they are caught, plus the offender is not able to by the non taxed gas in the future.
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