It explains it on the page
"To maintain our own high standards, we've had to shave a teensy bit of accuracy off everyone else's. For instance: there are 8 furlongs to a mile, which means 25 miles should convert to 200 furlongs. But it actually converts to 199.something furlongs. As our technical wizard explains: "To turn a mile into anything else, it first needs to be converted into linguine". "
It is a linguine rounding error.
Biting the hand that feeds IT
