[P-hack]

but if you actually measure your hp demands at a given speed (say 55) and choose an engine that is just the right size and sprocket it to a clutch and wheel, you are looking at maybe %98 transmission efficiency, the battery/motor can smooth out the fluxuations in power demands. And you have an efficient hiway assist, a sequential gearbox with air (or solenoid) shifter could be controlled remotely too.

And if your car supports regen it can even load the engine while driving if the charging the batteries for efficiency strategy even works out (TBD). Though pulse and glide would be better.