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Message: <blockquote data-quote="Old Timer" data-source="post: 2006865" data-attributes="member: 24440">I use avgas in my small generator. It has a 5 year shelf life. Extra gas is no ethanol with stabilizer bought after the refinery change over to the winter grade of gas. I rotate it spring and fall.I run my diesel generator every 1-2 months with a 220 heater that puts about 60% load on it.Diesel is easy to store. Add conditioner each year, and rotate every 2-3 years. It will go 10+ years if things are perfect. You can send in a sample each year to know what you need to add to it.I don't think the added expense is worth it. I just rotate it.</blockquote>