How much less energy would it take to make (electric) vehicles out of carbon? There now exist all carbon PM-free motors, all carbon and copper free cables, and

How much less energy would it take to make (electric) vehicles out of carbon? There now exist all carbon PM-free motors, all carbon and copper free cables, and there are organic and inorganic carbon-based substitutes for metal and plastic. Are bioplastics less energy intensive in the automotive industry too?