Eh not really. My parents put in a natural gas generator two or three years ago with an auto kick function. The gas bill according to them is worth it for powering the entire house. I’m not sure how a propane generator would be more efficient.I've heard reports that generators on natural gas consume so much it drive your gas bill way up. Where propane would be cheaper
Every Saturday it kicks on for 20 mins or so as a self test. Dad says that is a blip on the gas radar and not really something he even thinks about.