I love that Toyota is forward thinking, but where does the ammonia come from? The most common way to make it is via the Haber-Bosch process, which, as I recall, consumes 1% of global energy product as of today. I wonder what that number would look like if we manufactured fuel that way?
Pretty sure this is best read as an alternative to Hydrogen for the "future renewable energy will be plentiful, but sometimes we still need higher energy density".
It clearly wins by one measure (it's easier to make it a liquid, which is easier to handle than a gas), but I'm not enough of a chemist to really understand the table in the link downthread for how it compares by other measures.