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I prefer HP tanks, but you'd have to compare different capacity tanks to see why. A LP95 overfilled to 3442 psi gets you ~123cf gas and has about the same physical dimensions as a HP120 tank. A HP120 filled to 2700psi gets you ~95cf gas. You can safely underfill a HP tank (that is about the same physical size, yet lighter) to get the same amount of gas a fully filled LP tank of similar dimensions gets you.
So if you plan on overfilling a LP for higher capacity, you should be comparing a LP80 to a HP100 and a LP95 to a HP120.
Jack
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