I bought my 2008 420 Rancher last month. It had only 17 miles on it and 19 hours from "just running it". The previous owner had the "20hour" service done and I think had the fuel system drained and serviced at that time. I’m sure that the gas in it is at least one or two years old and want it gone. I’ve put another twenty miles on it and it is running fine, but I want fresh fuel in the system. Question: do I need to run the tank down to needing to switch to reserve and run that down to clean things out, or will filling the tank when normally low mix in with the reserve fuel? Thanks, Bob