Never understood the CAFE requirement. Why mandate efficiency? One could mandate emissions (environmental reasons) or speed limits (safety reasons of others), but mandating efficiency is somehow doesn't sound American of free market.

Take this for example:
- When the prices of gas went up, people drove less, and found their own ways to be efficient. They complained at first, but as always people managed to adapt. (4 days work week, less polluting cars, car pooling, living closer to work... etc)
- If a 60 MPG cars become a reality people will drive more, more emissions, and more congestion on the highways.

Let the market take car of itself... Am I missing something here?

Just my $0.02!