Quote:
Originally Posted by Old Tele man
...since, typically, low-speed torque is the holy grail of fuel economy, I'd assume an opposed, simultaneously-firing, two-stroke, two-cylinder, turbo-charged engine with direct injection would be best for fuel economy.
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Unless you are running it like a two stroke with cylinder ports and crankcase pumping, you would need a supercharger (positive displacement). this would not be difficult to do, but the problem would lie in the energy density, or rather the heat that would build up having 2 times as many firings per X rpm. Not saying impossible, that is for sure.