I asked all the executives this question. Audi answered.
Our federal tax dollars go to the government so that they can create a Corporate Average Fuel Economy (CAFE). Automotive companies spend money to fight CAFE or to implement CAFE.
In either case, the consumer is paying more taxes or more for the car. Would it be better to give an escalating tax credit to the consumer that buys a high mileage car?
For example, give a tax credit of $5,000 for a car that gets 30 mpg and is 40% made in the USA? A bigger tax credit for more mpg and a bigger percentage made in the USA?