I've got a 20lb CO2 tank and a 80 Cu. Ft. Tri-mix. Unless you do a LOT of welding they will last a LONG time. I did most of the welding I needed on my body with 1 fill on the CO2 bottle. My experience has been, I less spatter with the straight CO2 and more spatter but a little better penetration with the tri-mix. My .02
-=>Lee<=- Due to budget constraints the "light at the end of the tunnel" has been turned off!
