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Right -- weight *helps* with coasting, and if you have an EV or hybrid, you can also "get back" some of the invested energy in acceleration. Also, acceleration is much worse for an ICE powered vehicle (they lose about 75% of the energy vs about 10-15%), so for a "city" vehicle you should have an EV and light weight, with aero moving down to third.
Back on topic: a larger crumple zone with lower weight and good aero all are desirable. But if you throw it all away with a low efficiency drivetrain, then lower weight is more important.
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