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I did hear a supposedly true story from years ago, about a man who liked to record his cars' mpg.
He went and bought a new car, and his friends played a joke on him by repeatedly topping up the fuel (in the days when filler caps didn't have locks) for weeks.
After a while they stopped doing that.
And the man called into the dealer and said that his car must have something wrong with it; for the first few weeks he was getting the usual 100mpg but it had recently fallen drastically...
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