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  • What fuel?

    Curious what fuel everyone is using and with what engine?

    Also, the if given the choice, 87 100% or 91 E10? It’s difficult to find 91 100% so I’m forced to choose.

  • #2
    Mid grade on the MCX. Believe your OM lists the same.
    Ran premium on the old LT1 because it needed it.

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    • #3
      Originally posted by Shaun R View Post
      Mid grade on the MCX. Believe your OM lists the same.
      Ran premium on the old LT1 because it needed it.
      Ilmor list all 3 grades for the 5000, but says performance may not be as good. Haven’t run 87 in it, so I’m a little curious about everyone else.

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      • #4
        I run 90 non ethanol and she growls.

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        • #5
          I’ve never run anything but 87 in ilmor 5.7s
          Aric


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          • #6
            What fuel?

            I get 90 non ethanol in my area but if I had your choice the 91 with 10% will give the most hp but 87 non isn’t bad either. I would treat it as coin toss depending on time of season. If it’s a busy weekend the 91 and it will burn faster but more hp. Then several tanks of non near end of year to clean out ethanol.

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            • #7
              91 no ethanol here

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              • #8
                89 octane in my mcx per the manual. I would run ethanol free if I could get my hands on it.
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                • #9
                  88 octane
                  NO CORN!
                  Station is 1/2 mile from my house and they sell a lot of it so it’s always fresh


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                  • #10
                    89 in my MCX with 1 oz/ 10 gal of Stabil marine each full up. Manual says ethanol is fine for my ‘07 and that’s all I use. If there’s non-ethanol sold in North Mississippi I don’t know where.

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                    • #11
                      Originally posted by mpasino View Post
                      89 in my MCX with 1 oz/ 10 gal of Stabil marine each full up. Manual says ethanol is fine for my ‘07 and that’s all I use. If there’s non-ethanol sold in North Mississippi I don’t know where.
                      Which StaBil product? Look for the Volvo-Penta stabilizer in the blue bottle.

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                      • #12
                        Originally posted by MC25 View Post
                        I’ve never run anything but 87 in ilmor 5.7s
                        Good to know. We have 87 100% at the ramp, so looks like that’s the route we will go.

                        Should of known, it’s not like 320hp from a 350 is exactly high performance needing high octane.

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                        • #13
                          What fuel?

                          Its more important to use quality fuel even if it is a blend with some corn . Read the Ilmore manual about choosing top tier fuel suppliers to keep your valve train clean. I run the last 2 tanks of the season with straight 87 (all i can get here) for winter storage only. The generic trucks that visit no-name gas stations , big box stores etc. Do not have the quality detergents for long engine life . 93 octane may be necessary with the 5.7 full ballast and a boat load of people to get to wakeboard speed .
                          Whats the point in buying a $100k machine and feeding it cheap fuel that will cause damaging deposits in your valve train .


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                          • #14
                            Have always run 87 but will never use fuel from a marina. Seen to many boats get bad fuel over the years.

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                            • #15
                              Originally posted by gwozhog View Post
                              Have always run 87 but will never use fuel from a marina. Seen to many boats get bad fuel over the years.
                              Hmm, thanks for that tidbit. Used marina fuel a few times as I had to, but usually it’s a station since I trailer. Have a few jerry cans for our longer trips this year.

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