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I don't mind other people adding gas to my gas tank because it means that they are using my car instead of a vehicle that gets 12-20mpg and my mileage tends to be pretty consistent, so I win by not having to go to the gas station as soon and they win by not using as much fuel.
I sometimes do the reverse figuring, because I know pretty well what kind of mileage I get, I'll check and see how much gas someone put in.
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