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Sounds like a Volt. An onboard generator charges a battery (so it can be setup for optimal output at a said rpm) once the plug in battery has been run low on charge. The car is propelled by an electric motor.
Gearing a motor down to 1000 rpm would be completely doable. In a hilly area you'd have to deal with fluctuating speeds is all. The engine wouldn't stall, it simply wouldn't be able to keep you up to speed.
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