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It's related to vehicle weight, electric cars can be significantly heavier.

My understanding is a model X is 20% heavier than a similar size mid-range suv like a telluride, which I would consider the same size SUV.

The Model X's curb weight ranges from 5,148 lbs to 5,531 lbs, while the Telluride's curb weight falls between 4,112 lbs and 4,482 lbs.

Model X is somewhat smaller than a Telluride, but close enough.