Consumer Reports did a story where a 250 lb. propane tank would last 2-3 months I believe. I would be happy to scan the article and sent it to anyone via *.PDF. It will be early next week. Send me your email via private mail. Thank you.
I find that fuel usage figure difficult to accept.
I have the manual for my genset (7.5 KW Kohler using a K662 multi-fuel engine) right in front of me, and its fuel use under ideal conditions is as follows:
Full Load Gasoline, 1.475 usg/hour
Full Load Natural Gas, 140 cubic ft/ hour
Full Load Propane, 47 Cubic feet per hour
Even at 1/4 load (which burns about half or more fuel as compared to full load, btw), I would use more fuel than 250 lbs in a week, let alone 2-3 months.
Roughly 50 gallon gasoline equivalent?