I think this comes down to if you are assuming stupid drivers or smart ones.
If I know I have to go 300 miles, and I have X battery charge and Y gallons of gas, and a few gears to choose from, I know for 100% certain that I can get to my destination with much less gas by using the engine to drive the wheels when it makes sense (i.e. when I can hold it within %85 of bsfc peak, which is almost 100% of the time), than I can by using the engine to drive a generator with a fixed 15% loss.
I also think it is a mistake to cater to stupid drivers, as you only breed more stupid drivers. Think of how many folks can't even drive a stick shift now.
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WINDMILLS DO NOT WORK THAT WAY!!!
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