Runs quiet. Motor is totally incaseed so hope that does not interfere with longevity. Incasement holds the heat in. Only put small amount of gas in to test it and digital readout for time remaining (F000) did not change from the zeros. But it ran for over an hour.
Starts well and provides sufficient power as needed for refrigerator, freezer and sump pump. However, requires partial choke to run smoothly. With choke fully open (i.e. no choke) engine tends to surge.