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as that document shows, the diodes are a big loss at high currents, at low current there is the magnetic losses and also the fan etc. I have been thinking of doing the mosfet rectifier thing , but using an international rectifier chip that does the same thing.
de-energising the alternator removes the magnetic losses, but the windage losses are still there. Some cars now have electromagnetic clutches on their alternators, they would not do this if it did not reduce consumption. Failing this, how about removing the alternator fan and using a controlled electric fan instead, and also disconnecting the feild winding when it would help?
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