I can't speak to well to wheel, but at the very least current research tech electricity to hydrogen to electricity round trips are 75% efficient. https://www.n

I can't speak to well to wheel, but at the very least current research tech electricity to hydrogen to electricity round trips are 75% efficient. https://www.nature.com/articles/s41560-019-0333-2 https://www.nature.com/articles/s41560-019-0333-2