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markyp
The only 'modern materials' being used in this decades EVs are the aluminium alloys used by Tesla for their mega-castings. Essentially all the EVs we can currently buy are converted ICE vehicles: electric motors have replaced engines, but we still have a legacy of gear boxes and half shafts. Add on the weight of the battery packs and the chassis, suspension components and brake systems have to be uprated, adding to the weight of these behemoths.
Until in-hub axial flux motors are adopted we have little prospect of Colin Chapman's mantra of 'add only lightness' reducing the on-road weight of EVs.