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Yes, I understand that. However, you could sum the total miles and gallons between the fill-ups, including the partials, and I think it would still work.
For example:
From a full tank, I drive 180 miles, and buy 3 gallons of gas. This partial tank would be impossible to calculate, of course.
From that partial tank, I drive another 30 miles, and then fillup with, say, 8 gallons. Taken by itself, this tank is also impossible to calculate.
However, if you add them together, you would have driven 210 miles on 12 gallons of gas. This calculation should be perfectly accurate.
This is the exact same calculation that is done for the average MPG, except it's taken over consecutive partials and the next fillup. This means that several consecutive partials could also contribute to the MPG for the next fillup, instead of just the most recent. In fact, they would have to for this idea to work.
Am I missing some knowledge that would prevent this from working?
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hufman 
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