Here is very small car industry, just one small factory, that has made Porsches and Saabs, it makes today
https://en.wikipedia.org/wiki/Fisker_Karma
It should be rather fuel efficient, is there anything like that made or sold in US?
Also these have been made, but currently are not being made as Think company did go under, but plans are to continue making those cars again I did read.
https://en.wikipedia.org/wiki/Think_Global
Problem is that such cars are not selling too well, they are bit too expensive, Volt was also mentioned to be poor selling car together with Leaf.
So those can't be sold even in here, even that mpg would be really great in electric car.
Also there is made Marussia B2 supercar, but it is not getting very good MPG.
Chevy might make Corvette to be a hybrid in a future, so maybe that is route mpg will increase in US made cars in future as technology matures they probably start put it into normal sedans too, then car would have that torque which I believe is why big engine is wanted.