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You are correct about the ground temperature - but there will still be some pretty major temperature variations. An example - say the gas station was almost out of fuel, and the tanker truck JUST made the drop five minutes ago. The fuel is not going to be at ground temperature.
I would also be willing to bet that most gas stations have their tanks sized to hold enough fuel for 1 or 2 days at the most - so odds really aren't that low of getting fuel soon after a drop.
The point I was trying to make (I sidetracked myself with the math) was that you aren't ever going to get consistant results unless you WEIGH the fuel as it goes in. Unless you live in Canada or Hawaii where the gas station weighs the fuel for you
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