It actually has one already! ... but I think I'll take it off :D . Even straight propane will not vaporise properly at -40, plus it is more electrical stuff to potentially go wrong. I'm not worried about the fuel savings as I'm not using this car as a daily driver, ultra-reliability is the key. In serious cold, even the most minor repairs / service will be very difficult and a frostbite risk.

That said, if I can clearly see how the entire system works, and be sure it is cannot interrupt the normal operation of the engine (running on petrol), then I might just leave it in place. But the tank uses the spot where I could put a second spare wheel (it has a swing-out spare carrier) which would be more useful I think, and avoid the need for a roof rack.

The plan is to drive back from Magadan in Feb - Mar 2017, using as few formal roads as possible (sticking to rivers and ice roads) and I seriously doubt there will be much opportunity for LPG.

As I understand it one of the reasons they use it in Eastern Europe is because it is less likely to freeze than diesel, although I would start the vehicle on petrol (and run it on petrol for a few minutes before shutting down because they do start better on petrol. Also, it's used so widely if you got any problems, they should be able to fix it locally, and if it it does go wrong, what does it matter? just go back to running petrol. I would deffo keep it.

Lots of lorries run on gas out there rather than diesel for that reason, so it is very widely available

what car is it anyways?

I guess I'm on the fence with the LPG. The only advantage really is the cost, and for a trip of a few weeks, it doesn't really make any difference to me.

The car is a 1996 Toyota Hilux Surf (3rd Generation) with the 2.7l DOHC 3RZ-FE engine and the W59 manual transmission. Very rare and a nice car. Needs a suspension upgrade and re-sealing the engine, cabin heater and a bed platform and it's ready to go!

coolio, well, keep us posted how it goes!