I have a suzuki df140. I normally run 89 non ethanol and mix Star TronEnzyme Fuel Treatment in with it. If I can't find non ethanol I'll run 93 with star tron. The 4 strokes are fuel injected so ethanol fuels are not as bad as they are on carbureted engines. I just wouldn't run 87. Fuel stabilizers and additives definitely help keep the engine clean.

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