Quote:
Originally Posted by Matt Herring
Over my first 12 tanks I'm almost dead on (MFD is less than 1% optimistic so far) with fill vs. MFD but the guys over at priuschat all use the MFD -2% to monitor their tanks (they calculated that margin for error over hundreds of tanks of their own). . . .
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Not all. I use calibrated trip meter and fuel receipts and always have. I calibrate the trip meter by both mile markers and GPS. I've always considered the MFD to be an estimate that is useful for short range studies.
BTW, I have to calibrate the trip meter because of different, aftermarket tires. This can also lead to over-optimistic MFD mileage reports. Some of us have speculated about getting four, donut spares and driving to various 'driving contests.' But that would be wrong ... funny but wrong.
Bob Wilson