I had a spare Argon bottle, so I had it filled with Nitrogen, $27, I have filled all my tires now for a couple of years. Now some Austr. Wanker Expert just shat on my whole program, whats a retired hippy to do? I have always been told/warned by Refrig engineers that Freon would leak where superheated steam would not in welded pipes, due to Molecule size, so the larger N2 molecules made sense to me at the time.