What’s the minimum ratio of Marine PRO I need to add? [SOLVED]

Thanks for the question, Marcus. Unfortunately we do not have a 1 gallon can for Marine PRO as of March 2023. Sea Foam Motor Treatment does come in a 1 gallon can. That would work in your boat as well.

You’ll want to add at least 1 ounce of Marine PRO per gallon of fuel. For cleaning, you can wait until the tank is low (1/8 tank or so), add two or three cans of Marine PRO, and run the boat until almost empty before refueling. For stabilizing fuel and storage, add 1 ounce per gallon.