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  #1  
Old 08-02-2009, 07:11 PM
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Premium fuel not needed at high elevation?

I just spoke with our local MC dealer and he suggested to NOT use the premium unleaded (octane 91) and use mid-grade (octane 87) instead because of the ethanol. He suggested that in order to increase the premium fuel octane rating, they actually add more ethanol to achieve this figure and that the mid grade would actually perform better.

Does this make sense nationwide or just higher elevations? Or is it even valid?

I've always been using the premium unleaded regardless....weather in Colorado or Idaho for my 94' LT1 engine.
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Old 08-02-2009, 08:02 PM
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Ethanol has a higher octane rating than gasoline, but what they do is add ethanol to 85 octane gasoline to get 87 octane. To get 91octane, they add ethanol at 10% to 89 octane.

Octane labeling at the pump is pretty accurate.
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Old 08-02-2009, 08:13 PM
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Isn't a waste to use higher octane then recommended by the engine mfg?
True or false?
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Old 08-02-2009, 08:19 PM
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i have run 89 octane in my last 4 inboards with never a issue. i think the main thing is to purchase gas from a store that sells a lot of gas that way you don't have to worry as much about getting old gas.

i have had only 1 problem and that was when i purchased gas from a marina on tenkiller lake and my fuel filter got plugged up. boat ran fine at low rpm's but would not open up to anything about 2400rpm.
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  #5  
Old 08-02-2009, 08:57 PM
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Quote:
Originally Posted by André View Post
Isn't a waste to use higher octane then recommended by the engine mfg?
True or false?
Not only a waste of money, but the engine won't perform as well according to everything I've read here. There was a nice discussion a while ago on it.
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  #6  
Old 08-02-2009, 09:00 PM
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Not only a waste of money, but the engine won't perform as well according to everything I've read here. There was a nice discussion a while ago on it.



I have always run 93 and my MCX will do 58.
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Old 08-02-2009, 09:04 PM
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Mid-Grade for me, I treat her to the 93 stuff everynow and then. No problems to date.
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  #8  
Old 08-02-2009, 09:09 PM
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Here is a discussion on it....http://mastercraft.com/teamtalk/show...ghlight=octane
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  #9  
Old 08-02-2009, 09:13 PM
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  #10  
Old 08-02-2009, 09:13 PM
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Originally Posted by TX.X-30 fan View Post
I have always run 93 and my MCX will do 58.
58??? What did you do, gut the interior? Rain-X the hull? J/K

I run 89 in my MCX.......I don't think Indmar recommends anything higher than that.
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