How do we get people to buy them? The 78 mpg AudiA2 wasn't really a smash hit...

Well, youcan ban cars with worse MPG outright, or, if you're keen to let people free to pollute all they want, put a massive tax on cars with worse consumption: this should be done on a liters per 100km basis: put a 10,000 euro tax per liter/100km above 5 in a standardized test run by an independent body.)

In the long run, we're all dead. John Maynard Keynes