Originally Posted by BajaSportsmobile
You might want to do an actual mileage test - they are called Lie-O-Meters for a reason.
I've found the gauges on modern fords to be very accurate, if not a little pessimistic.
Really, their fuel meter in strategy is very accurate. Injector volume is a known, it only has to count pulses. The only real error is in the odometer, since there is variation in revs/mile even within stock tire sizes.