https://www.caranddriver.com/news/a29581764/toyota-2021-mirai-cow-manure-hydrogen
The splashy Mirai could be powered for a year from hydrogen from a single cow's manure.
Toyota has been interested in cow manure for several years. In 2017, the Japanese company announced with Shell that they were building a powerplant in Long Beach, California, that would capture methane gas from dairy cattle manure and convert it into water, electricity, and hydrogen. The companies went ahead with their project, called Tri-Gen, as a "hydrogen-truck refueling station" in 2018.
"Toyota continues to demonstrate that fuel cells are one of the most innovative and sustainable technologies for light and heavy-duty vehicle electrification. This initiative with Shell further strengthens our combined commitment to hydrogen as a viable transport fuel," said Craig Scott, Toyota’s director of advanced technology vehicles, at the time.