How to best promote conservation?

With oil prices on the rise once again, it's time for everyone to start weighing in with their ideas on how to best convince carbuyers that it's time to conserve energy. The author of the article linked below thinks that it's time for an increase in CAFE standards, and argues that this is really a concept that's friendly to free-market ideals since it evenly applies to every automaker.  The UAW, on the other hand, remains hostile to the concept, stating that GM and Ford don't need any additional obstacles to deal with right now. Set America Free advocates incentives (tax breaks and government funding) in their plan to advance their goal of increased energy independency. What's really quite puzzling is that 91% of Americans profess to support additional conservation measures, but yet the average new-car fuel economy peaked in 1988 and has fallen nearly 10% since then.