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Okay, i'm not really sure if the limiting factor of these things is torque or power, so that may make or break the CVT argument.
I look at Ben's car videos and I see a car that has to either choose to be in the right gear to take off at a reasonable rate, OR go fast. A CVT gives you both.
I'd be willing to bet that just like a Diesel-hydraulic system has a "peak efficiency rpm" explaining their efficiency gains, you will find that any electric motor also has a peak efficiency RPM. Most likely it is a "medium pace" (ie, low-rpm causes high currents, high rpm requires higher voltage [i'm no expert, that's just want i see in the small motors i work with as a computer engineer])
Ben... here's an idea... take your car to a dyno shop! See if you can somehow also plot amperage against the torque&power vs rpm curve!
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