I guess we can assume you did not think that comment through very well. There are plenty of cars on the market today that get over 35 MPG, but the best selling cars are not small cars but midsize cars.
People in a free society have a tendency to chose to buy the vehicles they need and want. One can not carry a family of five and all their stuff in a midget car. How does one tow a boat or a camper with a midget car? My one daughter has five children, to get where they need to go. She would need to revert to taking two cars, like she did until she bought a seven passenger SUV
Why not pass a law that says the vehicle must get 70 MPG, while they are at it? We could get around on mopeds, if everybody had their own LOL
mike