Just wondering what the accuracy of the onboard MPG computer is ? Does Nissan give any stats on this? I had a 500+ mile trip and did some testing. I reset the computer and drove a constant 80 mph for 1 hour and it gave readings of 24.5 mpg. I reset and drove a constant 65 mph for 1 hour and had readings of 27.5 mpg. I was very pleased with the results but felt that they were high. I was expecting around 20 mpg @ 80 mph, and 24 mpg @ 65 mph. I did not have time to refill the tank to get a manual calculation, but in the past; the best I have done was about 18 mpg with a 50/50 mix of city/highway. This was with A/C on (it was 100deg today), 89 octane gas and 1 passenger. I did just turn 7000 miles, maybe the engine has finally broken in ???