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If you tune a generator's engine to run at a single set speed, it can run more efficiently then an engine that needs to have low end torque, and still rev up, that is one of the advantages of having a generator that is running at a constant speed, the whole set up can be designed to run at it's peek efficiency.
back in the 1980's a friend of mine started building a car like this, a small bank of batteries, a gas generator, but I believe he had some controller problems and sold his project, but the concept is solid.
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