[quote author=ASE-73 link=board=5;threadid=10509;start=0#76503 date=1035427067]<br>Go with Steel. Plastic gas tanks breathe where the "volitile additives" in the fuel literally evaporate over time. These additives assist in the initial spark-combustion of the air/fuel mixture. If gas is in the auxiliary tank for an extended period of time (3-4 weeks), this degradation does effect combustion. Also a consideration ... the plastic tanks have a seam that typically fails at some point in time. Spend the extra money and go for the better and long term solution. <br>[/quote]<br><br>Not sure that I agree with the whole evaporating deal explained here, but I agree that you should buy the steel tank. Yes, I know gas is extremely volitile, but I don't see how a plastic tank would be any worse than a steel tank, unless it had a large hole in it. If there is one thing plastic won't do, it's "breathe". If you let the fuel sit in any tank, be it plastic or metal, it will eventually turn gummy and less volitile, but that takes a long time, not 3 or 4 weeks. I also agree with ditching the 2nd tank and just getting the 24 gal rear tank. That should be plenty of gas, and will keep the rig more equally balanced front to rear, and left to right.<br>-Eric