Well I'm definately going to look into this a little more. I dont really know anything right now except what the taxi drivers (w140 300 SE and w124 260E) told me. I would likely do this on a 300 SEL or maybe even 420 SEL, 86 - 89.

Im not sure about availability here, but I looked into prices back in Poland, shouldnt be a problem to ship the kit over and buy the tank here. With the trunk size of the w126, I dont think it would be a space issue. Its good to hear that they dont explode, and they last longer, I just have to determine if availability of the fuel would make it worthwhile.

Omegabenz, I'll remember to email you when I start looking at this more in depth.

Snibble, later today I'll send you a PM and we can talk about our trips, I am also going back next year.