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The above generator may be able to recharge an EV at least partway, in a few hours. Therefore, leaving one in the car as a contingency might not be a bad idea. However, using a generator as a range extender is somewhat silly.
When you plug your charger into a gas generator, what you have is energy being made in the generator's gas engine, then a portion of that energy is lost in: the generator's electrical circuits, the charger, the batteries, the electric motor. Also, you'd need an enormous generator to do that in real-time. For a long trip, the only real option in my mind is to directly connect a small gas engine to a wheel.
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