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The main problem in this discussion (semi-hijack) is that we aren't looking at a typical situation, that somehow the range extender (which is pre-determined once you leave your driveway) is still malleable, so that leads to a lot of confusion about somehow the generator being more efficient. The efficiency of the gas generator depends on load and you have to pick a scenario, the 5 speed (or efficiency optimized cvt) can adapt in the hands of a capable driver who knows a thing or two about bsfc and hypermiling and situational awareness.
Pick a scenario (i.e. driving 1000 miles a few times a year), select the components for your generator system with known losses under various loads/speeds and lets compare efficiency (and cost if you like).
Consider also that lots of range extended miles offsets a higher initial cost of a range extender to a degree, but the efficiency becomes even more critical in terms of dollars with lots of miles too.
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