I thought I read that since it was an average that you had to drive for some time (days, months?) to get it back on track. So let me know if you think it will eventually correct, or if I should maybe pull the 12v power again to reset it. So if I fill up with gas it resets to 0.0, but goes directly to 41.x-something. Then I can watch it go from 41.5, down to 41.2, or if I try to maximize mpg it ticks up only a little to 41.6. Before the new OEM 12v battery I was getting a much broader normal range, and could get up above 50 mpg if I tried or below 40 if I gassed it.