As I've mentioned before on a previous similar thread, I wonder if the odometer is also 8-10% off. I don't have a GPS to accurately (well, as accurately as a GPS can measure) compare readings. In CA, they don't really have nice readable mile markers like they do in most other states, like AZ. If in fact the odometer is off as well, that means our warranties will expire 8-10% prematurely, and when it comes time to sell the car, it will read out higher than actual miles, decreasing value of car.....Those that lease will be paying 10% more for their miles.....So on and so forth......