Talked to my gas guy. Told him this story while shopping for my own tank. Told him, " guy has 100 gallon tank.... blah blah" his response was," no he doesn't. He has a 100lb tank and there is only few inches of head on a small circumference. He is burning through all the vapor dropping the pressure and there is just liquid in his tank now, you won't have that problem with a 100 gallon".
Hope that helps.