Hey all, Just wanted to get your opinion on my recent LP fill up and see if the numbers adds up for anyone else. Last week I had called my local LP provider to come put my final 100 gallons of pre-bought (1.43 a gallon) in as well as put another 100 gallons in at 4.09 a gallon (called around and price matched). So as of yesterday my tank was at 16-17% as per the gauge on the tank. Today they put in the 200 gallons I requested and the percentage of the tank now sits at 40%. Mind you my tank is a standard 500 gallon tank, which my provider told me that they do not hold a true 500 gallons, in fact last week when i asked them they said they hold 400 gallons. So this is where I'm confused. 200/500 = 40% 200/400 = 50% My tank was at a minimum of 15%, they wrote 10% on the paper. So either way I should be sitting at at least 55% at a true 500 gallon tank or 65% at a 400 gallon tank. The shop was not being heated last night and my house is roughly 1300 sq ft and i have my pellet stove going in the basement so the LP furnace wasn't running much at all and that's all that uses LP on my property. (-29 here this morning) I understand expansion and contraction due to the weather but there's no way it'll contract that much from my findings. So there it is, am I missing something in my calculations or am I being taken to the cleaners?