Actually auto's use something like 14% of the energy we use, so to be fair here are my real world suggestions, of which I think we can't do without...
1. Shut the damned lights off in commercial buildings wwhen no one is there. Cities are full of buildings where there are tons of large buildings burning lights that don't need burned. There are intelligent building energy management systems in use now that can acomplish this painlessly.
2. A real world rail system, including a passenger system that doesn't go from nowhere to nowhere in the middle of the night.
3. Cut down on the size of our retail stores. Why do we need nine million varieties of dogfood, six million varieties of breakfast cereal, a billion kinds of soda, etc? Or why do we need a ton of clothing stores at the mall? This is all space that is heated and cooled at great expense. Smaller stores and more online buying would mean more money available and more choices for those who like nice clothes, not less.
4. Cut down on the amount of busieness travel. The airline industry uses enormous amounts of energy.
5. Stop importing so much stuff. Moving all this stuff (mostly junk) from east asia to the west coast and then across America uses huge amounts of energy. We would do better to build things locally.
6. Cut down on school consolidation. More smaller schools. We wate huge amounts of time busing kids long distances, and they are in much less a state to learn after an hour bus ride to school.
Just a few thoughts, there are millions of ways more to save energy that don't involve automobiles as a main culprit.
Chris