[SoftTalker]

At some point, cheap trumps efficient.

Propane is easy to store, easy to transport, propane storage tanks are cheaper than batteries, require no high-tech manufacturing or rare earth elements, and I'd guess the energy storage density is higher.

Many (most) existing cars could be converted to run on propane and the engines will last longer and emissions will be lower as it's a cleaner-burning fuel.

[93po]

Some newer battery cell chemistries are using very very little rare earth elements

[pengaru]

A propane tank is basically just the hollow shell of a battery, made of even cheaper mild steel since weight is far less of a concern. There's no contest in this department.

Not that I'm in favor of combustion engines persisting.

[93po]

I’m not saying your arguments don’t hold. Just that the calculations may be closer than stated