Gas options

[dstockton24]

I'm sure it's been talked about plenty, but I have the Raptor 6.2L, which has do I want to run? My options local are 87 no ethanol or 89 or 91 with ethanol.

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[Mondo Ken]

This is from the Moomba Manual:

Indmar 6.2L Engines
Use a gasoline with a minimum octane rating of 89. See engine
owner’s manual for more information.

Indmar Marine Engines Manual:

6.2L Indmar Engines 89 Octane

I believe I read somewhere that the fuel can only have a maximum of 10% ethanol.

[larry_arizona]

89 with up to 10% ethanol.

Do not run 87.

If you run 10% ethanol use startron
Star Tron Enzyme Fuel Treatment - Concentrated Formula 32 oz - Treats 512 Gallons https://www.amazon.com/dp/B0014419UQ..._2Po0EbSM8D16G

or stabil 360 marine.
STA-BIL (22240) 360 Marine Ethanol Treatment and Fuel Stabilizer - Prevents Corrosion - Helps Clean Fuel System For Improved In-Season Performance -Treats Up To 320 Gallons, 32 fl. oz. https://www.amazon.com/dp/B001CAW2DK..._.Qo0Eb7MC0E64


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[jason1973]

I run 91 octane just because thats the only grade without Ethanol.

[sandm]

ymmv but for us over the last 14 years we use 89 and don't worry about ethanol in the summertime. a tank or 2 before winter we switch to premium non ethanol as that gas will lay up better than ethanol blended fuels over the winter. does not negate the need to run a gas prep like sta-bil for storage tho.
we don't use treatments during the summer as it's a waste of monies if you are using the boat every couple of weeks. these are just glorified car engines.