i just bought one yesterday and wanted to know how it is on fuel economy. i was using about a 4 year old redmax that needs an overhaul now (which is why i bought a new trimmer) and i was able to use it for over 2 hours on a tank of gas. i think with the FS100 i'm getting about an hour or just over on a tank. i know that the tank on the FS is about half of what a RM has. anyway... just wanted to know.