the accompanying optimus fuel bottles come in 3 sizes. Either 0.4L or 0.6 or 1 Litre. What size do you use or recommend? I will be car camping mostly and possibly backpacking. Apparently you must not fill them up completely but leave some airspace. This means that when you flip the bottle over no more fuel goes down the line-very handy for when you are turning it off as the fuel in the line is burnt off. Does anyone use a 0.4L size bottle for this or any other brand of white gas stove? I have the small might be too small?