I have a 2010 Insight, which I purchased in May of 2009. One of the early adopters. Living in Florida, you need to have the A/C on all the time, so my mileage has run from 35 to a high of 43 mpg on long highway trips. Or so I thought. I have recently begun to do the actual calculations, checking fuel purchased against actual miles driven and I have found that the automobile's computer overestimates the mileage by about 10%. Has anybody else found this? Is there anyway to re-calibrate the system, so that the calculations are correct?