I think you're on track when you say you're going to drain and purge/clean the tank. Using gasoline without ethanol is a good start, but even then, if the gas is going to sit in the tank for an extended time, why even store it at all? Fresh fuel is the way to go if possible, so if you're not going to be using the gas relatively soon, I'd suggest just leaving the tank empty and carrying a couple of 5 gallon cans. But, if you are going to use the gas in a couple of months, adding a good stabilizer (some question the red StaBil) is the way to go. I would be reluctant to use gas that's been stored in an RV tank for several months.
I use "recreational gas" (ethanol free premium gas marketed in this area) for all my small engine applications from my lawn mower to snowmobiles/ATV's and boats. I've had no problems with fuel separation, but if I'm not going to use my "stuff" for a period of time, I drain the tanks, run the carb dry and spray Seafoam in the cylinders. When I take them out of storage, I always fill them with fresh fuel.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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