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My understanding about this and if I remember correctly they charged the maximum amount that the pump will let you pump so if the pump will let you pump 50 gallons they authorize the dollar amount for that amount of gas.
After that they charge the amount of gas that you actually get and delete the first charge. Normally this happens fast enough that you don't ever see it on your account. If you were in the middle of nowhere though, they might have been using tile up for their credit card system and that could delay things.