There certainly are some niche use cases for less efficient methane: "Therefore, when we looked at the overall system optimization, it was clear that methane w

There certainly are some niche use cases for less efficient methane: "Therefore, when we looked at the overall system optimization, it was clear that methane was the clear winner. " Elon Musk's 'Making Humans a Multi-Planetary Species', https://news.ycombinator.com/item?id=14573837 https://news.ycombinator.com/item?id=14573837