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What about if you used a motor exactly like your wheels motors to run the accesories such as alternator, AC, power steering pump/vacuum pump? This way it could run when needed (say controlled by the voltmeter or A/C switch) so that you could also have peak efficiency of those parts also. You wouldn't have to have an A/C clutches this way and it would only use the exact amount of power it would need. They could even be direct coupled this way with the variable speed hydraulic motor.
I love your idea... but I have a few suggestions like this that I think will make it better.
Instead of a normal engine like you're talking about, what about a free piston engine? One with combustion on one side and hydraulic fluid on the other to provide a pumping action. Known for their efficiency capabilities, it could run on any fuel.
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