I have had my Mazda 3 for a little over a year now. Since day 1, it has average around 15mpg. The car quivers at high speeds, has too much oversteer, and there has been a rattling sound coming from the steering column. After taking it in for service (at University Mazda in Seattle), they said that the fuel economy is due to the 'break in period' for the engine; they said it takes 15k miles for this to happen, which is total BS. The whole Mazda experience has been terrible, and I cant wait until my lease is up to get rid of this car.