Advice wanted from high mileage owners - Page 3 - Triumph Forum: Triumph Rat Motorcycle Forums
Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.


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post #21 of 28 (permalink) Old 02-20-2017, 09:36 PM
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I just use the low octane in this bike. I have noticed the higher octane change nothing, no benefit I could ever see. No change with MPG, or pinging at all.
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post #22 of 28 (permalink) Old 02-20-2017, 09:51 PM
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I've also tried mid and premium with no noticeable difference in performance. Strangely I ran several tanks of ethanol free
and it seemed sluggish.
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post #23 of 28 (permalink) Old 02-21-2017, 10:03 AM
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Originally Posted by Luxlamf View Post
I run 89 usually, why do you run Premium on hot days? I find premium doesn't do well in this bike, other bikes only like Premium.
I use premium on hot days, or when I'm pretty sure I'll be sitting in traffic because the octane is higher, thus preventing detonation. Whether this makes any difference at all, I don't know.
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post #24 of 28 (permalink) Old 02-21-2017, 10:41 AM
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I run premium, but only because that's the only way to get ethanol free fuel in my area. The compression is low enough I doubt the octane matters much.
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post #25 of 28 (permalink) Old 02-21-2017, 10:46 AM
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My 904 likes premium.
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post #26 of 28 (permalink) Old 02-22-2017, 04:22 PM Thread Starter
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My choice yesterday was ethanol free 87 or 93 with ethanol. Fun choices! I've been averaging about 2 tanks of fuel per week.
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post #27 of 28 (permalink) Old 02-23-2017, 05:54 PM
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Quote:
Originally Posted by Zandor View Post
My 904 likes premium.
Here in Aussie land we have 91 normal 95 and 98 premium, I run 98 in all my bikes, it might not seem to make any differance but it does, premium will perform better at high speeds, will make your motor run cleaner and preform better in the long run it also make you get more miles out of a tank full, yes you pay more for it but getting extra miles out of it pays for it self in the long run.

Ashley
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post #28 of 28 (permalink) Old 02-23-2017, 06:39 PM
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Originally Posted by Ashman View Post
Here in Aussie land we have 91 normal 95 and 98 premium, I run 98 in all my bikes, it might not seem to make any differance but it does, premium will perform better at high speeds, will make your motor run cleaner and preform better in the long run it also make you get more miles out of a tank full, yes you pay more for it but getting extra miles out of it pays for it self in the long run.

Ashley
yes, in Austalia and other places we use the RON method of measuring octane values whereas in USA they use MON

https://en.wikipedia.org/wiki/Octane_rating

so 95 RON is 85 MON

but I differ regarding the benefits of using a higher octane rated fuel unless you are experiencing engine knock/ pre ignition. it engine compression ratio that gives performance, not a higher octane.

I have kept a spread sheet of mileage for the past 120,000 on my bike and have not found one iota difference regarding MPG or L/100

also as with all things measurable there is an acceptable engineering tolerance with the octane measure. 95 RON can actually be legally as high as 97 and 98 RON can be as low as 97, so they can sold as one another from the same tank if a test proves they are in tolerance.

as far as I'm concerned 98 RON is an overpriced commodity by sold by greedy corporates

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