Not only that, various companies seem to supply different amounts in a tank. I get 160 cu ft around here Instead of 150 or 200. Airgas bought out National Welders filling plant a few miles from me, and now there is a filling plant and a Airgas store 4 miles from each other. The fill plant already had a supply counter, and I rarely see any vehicles in the parking lot of the Airgas store. A guy I know previously worked at National. He said that when Airgas bought them out it went into instant ******* mode, so he quit. I buy from Arc3 locally here in town.