My local place to buy non-oyxgenated gas or ethenol free gas says the govenment is no longer selling this gas. Can't find any in Colorado. I was always told to run this in my modified machines or bad things would happen. What do I do now, is it ok to run 91 octane? Machines are modified with cans, heads, y pipes, intakes. They are an 2008 and 2009 m series 800 and 1000.