IMO
I think the manufactures need to do a totally new design on the ICE. Something that does not resemble a 4-cycle engine at all. "Too much thermal and mechanical loss".
F1 has pretty much tap out on how much energy you can get from a 4-cycle pistons/rod with tulip valve design.
Even the rotor engine has way too much surface area. Now some of the newer ones have made some improvement.
Also, I think combustion needs a redesign also. Nano fuel technology might be the answer.
Today's vehicle emission systems are very crude. Closed loop is a joke in itself. With today's technology we should have been able to run a cat less system and obtain even cleaner emissions.
OK I'm done with my rant
