Got ya...an exact and inexact science at best in the Gen II Prius for sure. I'm going to stick with the MFD minus 2% as it is what I started with in my fuel logs. I do have fill numbers on my logs as well and I chart them both on a separate excel spreadsheet to have all the bases covered. Like I said before, ironically my fill and MFD numbers are very close after 12 tanks...only time will tell if they are similar a year from now.
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