Sure, we can have the feds renew the 55MPH national speed limit on cars.
That will make lots of traffic cops really happy once more.
Nope.
We chose to buy a small car that gets 30 MPH or better for a commuter and general get-around town car.
So have millions of Americans, but America is a large country with millions more people then 1973, illegally hereor not, consuming lots and lots of petroleum, no matter what kind of car they drive.
As far as American cars go, Detroit could have come out with better small cars then the line-up they have right now, which don't really compare in comfort and standard options to Asian economy cars particularly well.
Sure, but you have industrialised China and the rest of the world competing for the same gallon of petroleum, which by most estimates is reaching its peak production and is or will be in decline.
6.3 billion people on planet Earth and still rising without an end, combined with a limited supply of easy-to-drill-oil on the peak, headed for a decline soon.
Something is gonna have to give out, sooner or later, unless something else comes into this equation.
All great ideas, but we had 30 years to do something about it, and we did not do much of anything, except go ballistic over Chernobyl and Three Mile Island and shut down our nuclear plants, which pollute much less then coal-fired plants.