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Afterall gasoline engines began at about 5% efficiency, perhaps air motors with some work could get beyond this overall efficiency point? I am curious if anyone has some insite into what factors make a air motor more efficient (or make it inefficient) just as I outlined the actual reasons why the compressor isn't very efficient.
That sounds entirely too complex.
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Pneumatic technology is very effective for some purposes. For example, it is excellent for running a turbine at a very high speed. The drill that your dentist uses is run by pressurized air. The tiny turbine in it turns a tiny drill burr at 300,000 rpm. However, it produces very little torque. (The ultra high speed makes up for the lack of torque when used for drilling.) But it isn't of much use for applications other than what it is intended to do.