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I'd like to see something like the Gen 2 Volt but with a lower output engine and higher output motors and possibly bigger battery.
The engine and both motors are used to directly propel the vehicle during acceleration. The relatively underpowered engine could run near peak efficiency while cruising and recharge the battery for when extra oomph is needed for acceleration and hills.
Problem is, the system would be too complex for the general public because they would set the car to use all of the electric energy, and then rely on just the low output engine to pull up a steep mountain pass. Either that, or they would allow the engine to recharge the battery for short town trips that could have been done on 100% grid electricity.
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