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Seafoam, per their tech guru
2 ounces per gallon fuel thru about 20 gallons for major cleaning of everything.

After that 1 ounce per gallon fuel in 1 tank as needed depending on quality of fuel
That may be 1 per month or every 6 months, with 2 oz per gal once a year
More than 2oz per gal does not work better
Less than 3/4 oz per gal is not effective.
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