I heard about Aircela- a modular gasoline from thin air generator company- from a comment in here earlier this week. It was never discussed in any posts so I looked into it because it sounded fascinating. The details are it costs about $20k for a unit, and one unit can produce about 1 gallon of pure 90 octane gasoline using water and a replaceable catalyst cartridge in a day. And that requires 75 KWh of electricity! On my grid that’s like $15 of power at carbon neutral rates. So it sounds like an amazingly impressive and economical impractical technology.