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Generally small turbines are not real efficient, nor are non-cogeneration turbines (where they have another use for the waste heat). I'm real sceptical about any inferred efficiency of the turbine unit, especially if "total costs of ownership" is based on the expected long runtime of the turbine vs replacing the ICE an arbitrary number of times.
I don't see notrogen as an efficient energy storage (or convenient) for that matter, any figures on cost of compression and efficiency @ extraction?
The only thing that comes to mind for best efficiency and some effort at compactness is a free piston regenerative (as in heat) stirling with linear alternator, and still that will have series losses to contend with (but minimal mechanical losses).
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