95, 97 or 99 RON - Ducati Supersport 939 Forum
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post #1 of 8 (permalink) Old 06-10-2019, 06:29 AM Thread Starter
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95, 97 or 99 RON

Interested to hear what RON rating fuel you are all using. So far I've been using 99 RON but not sure if I really need to?
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post #2 of 8 (permalink) Old 06-10-2019, 09:21 AM
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Nah, such a high octan rating is not required. You can run on 93 without issues. I run 95 simply because the price difference is negligible where I live.
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post #3 of 8 (permalink) Old 06-10-2019, 10:37 AM
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Like Amos says, it’s all the same. Unless your vehicle has a knock sensor (which the SS does not as far as I know), dynamic ignition or unless it’s been tuned for a specific high octane fuel, there’s no point in running a higher octane number. Manufacturers have to make sure bikes run on all available fuels so they will tune it for the lowest spec.

In some locations, a higher octane fuel _may_ have a lower ethanol content which may give slightly better performance but that’s a pretty big if.
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post #4 of 8 (permalink) Old 06-10-2019, 04:03 PM
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Road octane (R+M/2) rather than research octane is more commonly used when pumping gasoline. I buy 91 Road Octane if 90 Road Octane isn't available. Less octane is necessary at higher elevations.

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post #5 of 8 (permalink) Old 06-10-2019, 06:38 PM
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Im always on 91 cos thats the one most available for me.

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post #6 of 8 (permalink) Old 06-10-2019, 07:01 PM
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I tried 98 RON but had starting issues. There was an ecu update (reflash) earlier last year that overcame some fueling issues. Improved the starting but still took a few turns. I run 95 on the recommendation of the dealer's service manager, and 91 if I can't get 95. I avoid E10 or (obviously) E85. More than happy with 95, the bike seems smoother than on 91 (of course that's not any form of scientific test, just seat of the pants feeling).

Note this is in Australia and our fuel has a reputation for being crap.

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post #7 of 8 (permalink) Old 06-10-2019, 07:44 PM
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Not that it necessarily applies to the SS but the recommended fuel for the V4 is 95.
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post #8 of 8 (permalink) Old 06-11-2019, 04:25 AM
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Quote:
Originally Posted by stavros View Post
Not that it necessarily applies to the SS but the recommended fuel for the V4 is 95.
Says the same thing in my manual for the SS (95 RON), which makes sense around here as there is no lower spec available. The US version says 90, but they of course don’t use the same octane rating system as the rest of the world, so the numbers aren’t comparable. In any any case, i wouldn’t worry about the octane rating of the fuel.

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