I had an old Yamaha ef1000, it was surprisingly quiet if i put it inside a shed or large box you couldn't even hear it, they're great for car camping. A gallon of gas used to get me about 8hrs of run time. But what would be really fucking cool would be to get it working with wood gas... like this.
https://www.youtube.com/watch?v=4i3-w6MZP1USmaller gen could use a smaller burner and less wood.