I run a 2005 Merc Racing XS. I understand that Merc now reccomends you treat your fuel with both Merc Fuel Stabilizer & Merc Quick Clean with each tank full. I can find plenty of Merc Fuel System Stabilizer...but finding Merc Quick Clean is difficult. I'm about 65 miles from my nearest dealer. I read on another board earlier this week you could substitute Seafoam for the Merc Quick Clean. Is this accurate??

After you read my next question, you'll look at my name and think...DUH!! but here goes. My boat hold 54 gallons of fuel and is sitting fuel right now and the fuel has been treated with both the Merc Fuel System Stabilizer & The Merc Quick Clean. If I use my boat this weekend and burn 20 gallons of gas do I just treat the 20 gallons I replace with the Merc Fuel Stabilizer and the Merc Quick Clean / Seafoam....OR do I treat the full 54 gallons once again?