XKCD BotAn idling gas engine may be annoyingly loud, but that's the price you pay for having WAY less torque available at a standstill.
https://xkcd.com/2948/
https://xkcd.com/2948/
lp0 on fire 
Methane? Ethane? Butane? Propane?
Ed@xkcd The best thing about ICE is that they only work properly at very specific speeds so they keep the gearbox industry busy
🇺🇦🇪🇺 C. WeickhmannAs any petrol head can tell you: it's not about specs but manliness (fragile).