Most cars are bought used. A new car is not very economically sound purchase decision unless you are pretty well off. The buyers of these new cars don't care mu

Most cars are bought used. A new car is not very economically sound purchase decision unless you are pretty well off. The buyers of these new cars don't care much about fuel economy or CO2 emissions, and want a lot of car for their splurge investment. So the makeup of the vehicle population is chosen by a relatively irrational and/or affluent minority of car users.