20# propane tank

I would assume you mean with air, not LP gas! LOL
If you ever empty one of these tanks, the gas will be exhausted from the tank a long, long time before that terrible smell is!!
The way I see it, there are three variables here: #1 is how much pressure is in the tank and #2 how big a leak does the tire have. #3 How big a 15" tire it is.
I use an old 20# LP gas tank for "spare" air and if I fill it to 95 PSI it will comfortably fill a 6.00 X 16 tire on my WD-45 to about 30 PSI. Keep in mind that the tire has a very slow leak which took most of the winter to go flat.
An average 15" automobile tire would probably hold more air than my tractor tire but I would think you could put enuf air in it to safely drive it far enuf to get more air or get the flat fixed.
 
sorry: i didn't explain myself - i had a propane tank that had the old style valve i removed the valve filled it with water rinsed it then let it air out & made a air tank from it. i then filled it with air( expelled it) and filled it once again putting 130lbs in. i didn't know how much volume it contained- thanks
 
I was at a service station one day when a woman came in with one and ask the attendant to put air in it for her. She said "Don't put but 20 lbs in it or I won't be able to carry it.
 

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