I think that weight is a lot more important when you have a internal combustion engine, than when you have an electric motor. Because when the engine is wasting about 2X more energy than it is producing, acceleration is a huge loss. With an electric motor you are losing only 1/10th the energy, so acceleration is not as critical -- and you can return 60-75% of the excess kinetic energy back to the battery with regenerative braking.
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