Funny, for all those "crazy Government mileage requirements", I find that the cost of new cars has generally risen at slower than the rate of inflation, even as they offer more features, better reliability, and (thanks to said mileage requirements) lower fuel costs.
Case example: My parents bought a Geo Prizm LSi (also marketed as the Toyota Corolla) back in 1990. At the time, it cost ~$12.3K. It was much smaller than the current Toyota Corolla, the electrical system sucked (adjusting the power windows dimmed the headlights and radio), etc. The LSi add-on features (power windows) are all standard now, the MPG has gone from 21-22/26-28 MPG city/highway under the old system (that rated all cars better than what you'd actually get), to 27-29/36-38 MPG under the new, more realistic rating system (and remember, the car is actually bigger now than it was), which reduces your fuel costs by a third or so. Yes, the cost is up, between $19.5K and $22K for most models (remember, the 2015 low end model is still better on features than the top end model of 1990). But that $12.3K from 1990 is ~$22.4K in 2015 dollars (according to U.S. Inflation Calculator). So the price actually dropped in inflation adjusted dollars, while the car got bigger, more efficient, and got more "luxury" features.
Remind me how big bad government mileage requirements are making cars so expensive?