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I just bought my '96 Echelon and am going through all the usual new owner questions. The owners manual recommends 91+ octane and I also want to go nonethanol fuel as well. I have searched many gas stations in my area and the closest I have found to what I need is nonethanol 89. The owners manual says the Mercruiser 350 magnum MPI scorpion can run on up to 10% ethanol but I've read a lot about the down sides so I'm not sure where to make the sacrifice.


Should I go for the higher octane (93) with 10% ethanol or 87/89 nonethanol?

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1 hour ago, auj130 said:

I just bought my '96 Echelon and am going through all the usual new owner questions. The owners manual recommends 91+ octane and I also want to go nonethanol fuel as well. I have searched many gas stations in my area and the closest I have found to what I need is nonethanol 89. The owners manual says the Mercruiser 350 magnum MPI scorpion can run on up to 10% ethanol but I've read a lot about the down sides so I'm not sure where to make the sacrifice.


Should I go for the higher octane (93) with 10% ethanol or 87/89 nonethanol?

If your engine has knock sensors, it is probably OK to go with 89 nonethanol. 

On the other hand, the Mobil station at 4336 Park Road in Charlotte, NC should have 91 non ethanol, and is maybe ten miles from you.

https://www.pure-gas.org/index.jsp?stateprov=NC

https://www.pure-gas.org/index.jsp?stateprov=SC

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1 hour ago, justgary said:

If your engine has knock sensors, it is probably OK to go with 89 nonethanol. 

On the other hand, the Mobil station at 4336 Park Road in Charlotte, NC should have 91 non ethanol, and is maybe ten miles from you.

https://www.pure-gas.org/index.jsp?stateprov=NC

https://www.pure-gas.org/index.jsp?stateprov=SC

Thanks, I'll look through the manuals and see if there is a knock sensor. I've tried those links but they have been spotty for accuracy, next time I'm up in Charlotte I'll check out that station.

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