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It must be. Unless there's some huge rolling resistance or inefficient calibrations going on, it *must* be either weight or drag if they use the same powertrain. No one ever lost economy by making a car lighter, so there's your answer.
It's roughly the difference between an upright bicycle (dutch style thing) and someone on a time trials bike.
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Originally Posted by Crazyrabbit
In God we trust. All others: bring data
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