Just curious.... Why are propane tanks listed as 30# or 50# etc... ?<br /><br />I just bought a 50# can, and if you do the math: 4.24 # per gallon = 11.79 gallons.<br /><br />Wouldn't it just be easier to call it out by the gallons? <br /><br />Would make a whole-lotta sense to me!<br /><br />H.