Batteries and lots of copper and aluminum. Steel is cheap. You also have better economy of scale in IC vehicles for now.

I feel like we're dismissing other hydrocarbons too early. When I was a kid, people had propane or methane cars which were basically converted gasoline cars. Sure, not anywhere near as efficient but combined with hybrid tech for regenerative braking you likely have a more efficient car overall(nat gas is less refining energy than gasoline IIRC and we have a lot of it). You can also build them a lot cheaper since they use smaller electric motors, less coppper, less aluminum, and less lithium.

Yes I know BEV zealots hate hybrids but until we have better Li supply chains we need to conserve it and get more vehicles off of pure IC drivetrains.