We’re introduced to the traditional two-stroke diesel engine as thermally efficient but not smooth-running, and then the gas turbine as smooth but much more inefficient. The free piston engine ...

If you have a car parked outside as you are reading this, the overwhelming probability is that it has a reciprocating piston engine powered by either petrol(gasoline ...

the engine is still running, just very slowly. While you may not be using the same amount of gas as you would while driving, piston strokes are still occurring, consuming gas all the same.