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A truly adjustable final drive ratio, would mean you could change the ratios through a broad range. This would allow you to match best BSFC with load when conditions allowed that much power to accomplish the work required.
What is really needed is high efficiency capacitive storage so that when best BSFC power levels exceed the load requirement, best BSFC power production could be maintained with surplus power stored for future application.
When sustained loads are low and it is not possible to use best BSFC the the capacitive storage is replenished. When that same capacitive storage has reached it's maximum level then the drive can use storage and the fuel consuming power plant can be shut off for a short period of time.
Pulse and glide allows this most efficient use of best BSFC but requires speed variations since the vehicles mass is used for storage. When storage is separate from the vehicles mass then speeds need not vary as they do when incorporating P&G.
regards
Mech
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