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The cars getting bigger and bulkier are ICE SUVs and trucks largely, things like Cadillacs, Jeeps, fully loaded trucks being used as commuters, etc. Tesla actually started larger with S/X then moved downwards in size/cost towards 3/Y. Most of the other makers have moderate sized EVs, like Priuses, Volts, Bolts, Leafs (leaves?), they're all modestly sized.

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EVs are still significantly heavier than the ICE equivalent though, compare models from European manufacturers that sell the same body in EV or ICE versions. The EV version is typically a few hundred kilogram heavier, or even more if you get a bigger battery.

Weight is certainly a variable one can point to, but EVs still end up VASTLY more energy efficient than ICE vehicles.

If you account for the hundreds of gallons of fuel inserted and burned by the ICE vehicle over time, much of which is then wasted as excess heat energy, the "weight" of an EV's battery starts to look pretty good.

Passenger cars have also gotten significantly larger since the 1980s/90s. I think its mostly to do with enhanced safety features.

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