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engine
why cant the engine be sized such that for the normal daily commute most people face it is sufficient, but for hill climbing or other high energy stuff the engine works with the electric at the same time to produce the required torque?
For example, car with a 50 hp engine and a 50 hp electric motor. During acceleration both would be on to produce the fastest 0-60; when you just maintain speed it could switch between the two depending on battery charge level. The 50 hp engine would likely have a sweet spot around 40hp, so 27hp would charge the batteries until a certain percent and then it would switch.
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