Great. So I forgot my wallet because I brought it in the house. Usually I leave it in the console, but I decided that was kind of a bad habit since I keep my spare key in the wallet.
So I get to the pizza joint where I got carryout, and realize my wallet isn't in the console. Ok, well, I keep $25 in the glove box in case I forget my wallet and need gas.
Oh look, I need gas, too. So I do some quick math, and... I should be good to put my remaining $8 in the tank, drive home, and make it to town tomorrow morning to get gas. At worst, I will just need to use my reserve tank to get to town in the morning. My gas gauge is very pessimistic and reads low when I still have like 7-8 gallons left, assuming that's the original 25 gallon tank on there.
Lunch should not involve math.

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