That link was a funny read!
Fuel logs are only as good as the info going into them. I always gas up at the same time in the morning, at the same gas station at the same pump, stop at the first click, and round to the second decimal. I take pics of the mileage, the gas price and total gas pumped and enter them when I get to work.
I keep a "cost of ownership per mile" spreadsheet, but that one's harder to feel good about. It gets better every tank, but the initial outlay makes the first thousands of miles pretty expensive!
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