we have just over 65k miles on our 2005 and have been checking mileage since day 1. variation from the car's calculator have been consistently low. over the total 65k we are about4.5% lower than the car says. is this common? 2 different tires have made no appreciable difference.
That sounds on the low side of normal. Many people have reported the MFD being two or three percent optimistic. Tom