On: In the US, it's cheaper to build and operate wind farms than buy fossil fuels

I am aware of the Carnot efficiency, my issue with the engineers is that they can't make big gains anymore, exactly because of the Carnot limit.

Best way of making a gasoline car (not the engine - the car) efficient is taking the throttle of the engine out and attaching a hybrid/regenerative generator/motor to it.

The best way of making the car efficient is doing something about the fact that we use two tons of steel to move 100kg of human.

Yes, but that's a market problem ;)

Maybe the electric scooters/mopeds are the solution?