> I'll prioritize the 0.005L per 100km car for sure. That means the car can be driven for all its expected lifetime (500k km) in a single tank of gas, filled up

> I'll prioritize the 0.005L per 100km car for sure. That means the car can be driven for all its expected lifetime (500k km) in a single tank of gas, filled up at the time of purchase! It's a nice idea but it wouldn't work. The gasoline would go bad before you could use it all. Plug-in hybrids already have this problem. Their fuel management systems try to keep the average age of the fuel in the tank under 1 year. The Chevy Volt has a fuel maintenance mode that runs every 6 weeks: https://www.nytimes.com/2014/05/11/automobiles/owners-who-are-happy-when-the-engine-doesnt-start.html https://www.nytimes.com/2014/05/11/automobiles/owners-who-ar... https://www.autoblog.com/2011/03/18/chevy-volts-sealed-gas-tank-brought-automakers-carb-together/ https://www.autoblog.com/2011/03/18/chevy-volts-sealed-gas-t... Instead of having a "lifetime tank", a car that uses 0.005L per 100km would be better off with a tiny tank. And then instead of buying fuel at a fuel station you'd buy it in a bottle at the supermarket along with your orange juice.