Yes, indeed the devil is in the details that is why I am pointing you at volumetric efficentcy. Where in EVER did you state MPG as installed in an automobile as your base line? Or MPG as a base line for efficientcy? Not until after I made my post concerning up to 92% efficiencty from a given engine. When you were previously speaking of efficientcy, I asked you 4 times to explain your meaning? You did not- until now. I was and still am speaking in terms of engine efficientcy- how power's created, amount of fuel consumed= output, from the engine. There is a reason for this and if you think on it you will understand where I am going. No mention EVER of any other mediums (as a car in motion via it's running gear ect.)- this is why I asked you 4 times to make yourself clear so we can communicate on the same page.