The IC Engines of our future may be on
the small trailers we tow behind our battery electric trucks to give them useful range?

If that is the sad future
a tiny multi-fuel high horsepower I6
connected to an inverter type electric generator
that can output multiple voltages and phases (including aircraft style 400 Hertz 3 phase )
can be thought of as an advance

The FSM for such an I6 will probably be 8000 pages long.
Set it by the toilet and read 8 pages a sitting.

Chandler Six
are you ashamed of your great grandchildren?