Wow did anyone even answer the original question......
If no..... Then your perfectly fine running your gun on propane at $3 a bottle with some oil added to it or on green gas at $22 a bottle.
In the end it's the game gas so no issues.
Now getting back to the whole gas compression issues that all of you Toronto based boys seem to like arguing about. We will have to have a chicken slaughter the next time I'm put then I will give a fine gas compression demonstration.
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http://airsoftcanada.com/showthread.php?t=174161 - Honour & Respect your fellow players! #Airsofthonourandrespect