The Chevrolet Volt.
40 mile battery range and a 150 MPG fuel economy at 60 miles/day.
Is your commute less than 40 miles both way? You'll never burn a drop of oil getting to work.
That's 80% of America, folks.
And this baby hits the streets in a year or two with a starting production capacity that is 10 times the level of the starting production capacity of the Prius.
Moreover, it can run on E85 ethanol (if you want to bother) and I'm sure that later models will include other forms of biofuel as well. That assumes that anyone actually needs to drive more than 40 miles one way on a daily basis.
Cost to build/retool the ENTIRE US auto manufacturing capacity AND all of the manufacturing capacity of the plants that we import our cars from?
$60-$80 billion. Also known as a rounding error in the broaden scheme of things. We spend about a trillion dollars per year on cars already, what's another 6%? Especially when you consider that it's a one time charge.
We haven't touched our ability to conserve oil.