I have a Honda Strikemaster that I haven't used in a long time. Store with Trufuel and a dash of Seafoam.
I run vp pre mix gas same thing as true fuel just different brand ran it for last 6 years put away as is full tank half tank or just about empty and just start and run 3 to 4 times in the off-season and have not had any issues......I also dump gas out and put fresh stuff in beginning of season. I don't know that I would have to beings the stuff is pre treated and is supposed to have a 3 to 4 year shelf life. It is spendy but worth it imo