[SoobieOut]

I agree with this concept only if you account for the number of possible people in each car/truck.

Increasing the fuel economy of a 14 passenger carpool van from 10 to 12 MPG does result in larger savings than a small car, with just a driver, going from 30 to 60 MPG.

I would like to see a sticker on new cars that multiplies the number of possible occupants by the MPG. This could mean a 14 passenger van could get better MPG per occupant than a typical econobox.

Edit: In other words, it would do more good to get rid of the single occupant in a SUV or Pick-up getting 14 MPG, and put them in a carpool or a car that has great mileage like a Prius.

One way to discourage large cars/trucks is to make parking spots smaller and smaller. Or get rid of parking altogether. Taking advantage of lazy drivers is key here. Making it harder and harder to be wasteful of energy.