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i fill my tank because I'm actively modifying the newly aquired car and looking to get a baseline to pull results from. Once I hit a plateau, get bored, or broke and need that last 1/2 tank ill quit and just throw $20 in at a time. MPG's are a pretty direct indication of the health of your vehicle (if you arent extreme hypermiling at the time). Once in a while I'll fill tanks 2-3 times in a row in other cars to see if they are getting the same output from a year ago etc.
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