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Mule Pro FX Octane Requirement

davegood

By davegood
in Kawasaki UTV SxS Forum

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davegood Newbie

davegood

Posted
Posted

Mule Pro FX manual specifies 87 octane gas for the MulePro FX. In the non-mountain states that is "regular" gas. However, in mountain states "regular" gas is 85 octane. Was this an oversight in the manual, or is 87 actually the minimum octane required (this would require "midgrade" gas in mountain states. My Ford 350 V10 vortex requires 87 octane so it is strange that a utv would require the same.

I am still in the "shopping mode" for a utv so the answer to this question will help me decide on brand. Thanks.

  • 5 years later...
cliffyk Rising Star

cliffyk

Posted
Posted

The only way to be sure is to run some and listen for signs (detonation predominately)  of its not having sufficient anti-knock properties for your engine/l location and the weight of your right foot.

Here's a good, "more than you probably want to know",  Octane 101" document.

Your Pro FX is only 9.5:1 compression, that's no where near requiring premium grade fuel. Apparently one or more "automotive engineer" bureaucrats decided that 85 octane would be OK for "regular" grade fuel in the "mountain states".

Oddly, fora  bureaucratic action, there is actually some science behind that--air at higher altitudes has less oxygen content, making it less likely to fuel detonation l (no pun intended). So 85 octane may be OK.

FWIW the owner's manual for my Coleman Outfitter 400 says this about octane--It is incorrect.
Gasoline of Research Octane Number (RON) 91 is the same as an  [R+M]/2 "[(Research + Motor] average, aka  "USA pump rating") of 87.

Its compression ratio is only 9.3:1 for Christ's sake!

ColemanOctane-00.jpg.4a4251fc945f32dcb6772a4f68e7fb44.jpg

 


Just run some, drive normally and listen to what the engine tries to tell you. My 2012 Infinity M37 (11:1 compression ratio ) has a "Premium" (91 [R+M]/2) octane recommendation--however I have been running 89 octane for 8+ years and 112k miles with no problems, even at WOT at 165 MPH...

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