> To give you an example of the folly of fuel economy regulation, consider that 90% of automotive pollution is created by the oldest 10% of cars on the road. Do

> To give you an example of the folly of fuel economy regulation, consider that 90% of automotive pollution is created by the oldest 10% of cars on the road. Does it really make sense to force all buyers of new cars to pay extra? Why not charge a tax that increases for every year a car gets older, so that the person driving the smoke-emitting clunker has an incentive to upgrade into something that is cleaner and safer. Isn't the problem the pollution emissions, not the age of the car? Charge people an emission tax based on manufacturers' guidelines, and then switch to periodic measurements after the car is greater than N years old (N>5). That way, people can buy new, polluting vehicles as they wish & their budget can stretch to. This is the UK's approach, which works because cars have a yearly check for roadworthiness.