Found a chart with amperage use and if I'm using my fridge and AC looks like I'm at approx. 17 amps. Round it off to 20 and according to the chart that came with the generator, I would need a 12 gauge cord to supply 20 amps for up to 30', so that's what I will buy. I plan to keep my generator down at the street level by my garage. My house sits on a dune ridge so after running the extension cord about 12' in elevation plus whatever length is required to run horizontally from the generator location and through my window into my living room, 30' should be adequate.
There was no information in the literature about how many hours a propane tank will provide so I will keep looking for that info and post when I know more.
I got the generator out of the box and attached the legs, wheels, and handle, and now have to add oil and gas and then a test run. More later.....