Well my 7K gas house generator just finished a 30 hour workout. My first extended outage since I moved to this house. I was going to switch the house over to my farm 3K diesel Yanmar which I never have done before to save fuel. However, it has a 20 Amp 3 prong (one flat prong horizontal, one flat prong vertical and then a ground) outlet rather than the 4 prong 30A my other generator has. I do not know if there is a simple adapter or not. A few things I noticed:
-Microwave worked but sounded different. Almost a slow cycling sound.
-Comcast stayed operating for TV, internet and land line.
-Whoever figured out which circuits need emergency power did a good job.
-With the wood insert running the house stayed comfortable, outside temp around 30