It's got me stumped. It's usually off one way or the other by .2 gallons when I fill up (tonight, I put in 9.672 gallons, and it estimated 9.5), but there doesn't seem to be any rhyme or reason to it. It seems to have reached the limits of its accuracy with the hybrid system; one reason for the constant error may be the blanket .02 GPH estimation when running in EV mode.
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