Yes.. 140 hours per gallon.. 20 lb tank is I beleive 4.7 gallons... I also confused the btu's.. It's 3200 on lo and 4500 on high. They claim 100 hours on high per gallon. I would think it would depend on a few factors, plus be hard to judge if your cooking and running a fridge etc... I think the p12000 is 8000 btu on high.. Might account for the difference... I guess it's a case of if you put it in, it uses what it uses.. So choose wisely if you even need it.