Quote:
Originally Posted by MPGomatic
Note: I usually wait until below half full to refuel,
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this is possibly why or at least contributing. fuel gauges are not always linear, though certain vehicles are far worse offenders than others. every GM vehicle I've been in likes to hang onto Full for nearly 4 gallons of usage, then drops fairly rapidly down towards empty, then when on empty, there can be anywhere between none and ~2.5 gallons of fuel in the tank.
it's kind of dumb, but it works well enough.