Pretty accurate, actually. The more it averages the MPG, the better it's accustomed to your driving habits. If your driving habits over the past month of driving shows you get 20MPG, then it's more likely that 20MPG will reflect your every day driving habits over the course of the full gas tank.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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