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The 2018 definitely runs best on 91 octane(recommended). That said I have ran both 87 and 89 with no problem if attention is payed to how you apply the throttle. No lugging or full throttle. The West is full of small towns that only have 87. Mileage has not varied enough on any of them to tell. Non ethanol included.
 
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"The West is full of small towns that only have 87."

this ^^^

Yes some areas you appreciate the gas station has fuel and is functional never mind if it has any premium stuff.
 

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The West is full of small towns that only have 87..

Say what?

Not the west US I live in and I've been to a lot of places out in the middle of nowhere.

Like this for instance...



Might not be a gas station for 150+ miles but when you find one it has 3 grades of gas, diesel and a mini-mart!
 

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I recall rolling into Amboy CA on fumes and they had some problems with dispensing fuel so AAA brought me fuel from 60 miles away.

Same thing in Tecopa CA. I couldn't get anything from the pump. Attendant said they called tech folks. I had to change plans as fuel became a priority.

Dyer NV was out of fuel once when I stopped in. Didn't need fuel but I made a mental note not to need fuel there ever.
 

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People associate higher octane fuel as higher quality fuel. It is not. All gasoline from the refining process is essentially the same. Its not until manufacturers add there chemical "additives package to it" to make it proprietary and create the octane rating. Interestingly enough ethanol is an octane booster. The very evil thing throngs of people get up in arms about when they hear its in their fuel.

The best octane you can run it the lowest your bike doing not experience preignition/pinging/detonation on. For an overwhelming number of people the it 86/87 octane. The DL is not a high compression engine and lower octane fuel that the manual calls for is more then sufficient to run each time every time you fill up.

Running too high of an octane and you get incomplete combustion which means lower power output and the potential for carbon deposits.
 

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Spec, ever been to Denio or Fields?

Doesn't ring a bell, Nevada somewhere?

I always top off before a long empty stretch, even carry extra gas now on my 1000.

Cause you know the throttle keeps opening up on those long straight bits, gas mileage takes a hit! I saw mid 20s a few times into a strong headwind at 85ish.

Faster must go...

 

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The best octane you can run it the lowest your bike doing not experience preignition/pinging/detonation on. For an overwhelming number of people the it 86/87 octane. The DL is not a high compression engine and lower octane fuel that the manual calls for is more then sufficient to run each time every time you fill up.

The Gen 2 1000 has a 11.3:1 compression ratio.

I'll stick with premium.
 

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In my DL1000 I tried 91 for shit and giggles one day and I do believe I felt a positive difference. I typically run 89 if filling at a station. If filling at home from my boat gas I keep then its non ethanol 87. The non ethanol feel like the 89/91 ethanol.
 

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The best octane you can run it the lowest your bike doing not experience preignition/pinging/detonation on. For an overwhelming number of people the it 86/87 octane. The DL is not a high compression engine and lower octane fuel that the manual calls for is more then sufficient to run each time every time you fill up.
my manual clearly calls for premium fuel with a minimum pump octane rating of 90.

could I get away with a lower octane if I babied it a bit and didnt put too much of a load on it..... maybe but why would I want to take that risk? in a pinch, yes. in the short term, I'd buy octane booster and carry that. for each time, every time.... no thanks.
 

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"Doesn't ring a bell, Nevada somewhere?"

Northern Nevada, southern Oregon. Smack in the middle of No Where Scenic-ville.
Funny though, in Oklahoma I thought I was smack in the middle of kinda lost and didn't know where I was going and found a gas station/video store.
Someone must being living near bye.
 

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Spec, I respectfully disagree. I was in Keller WA last week for a gas stop and they only had 87 octane. And Diesel. Nice little store with a deli and they had Octane Booster, which my son on his TL bought and used for fear of detonation at the high temps outside. I just added a bit of 87 to get to his next gas stop and filled with premium. I use that because of the ignition advancer and HC pistons in my old K6 Vee. I lost my high frequency hearing at a young age and it hasn't gotten better in the last 60 years or so. I can't hear detonation, pegs scraping (which I can feel), etc. Better safe than sorry.

Not to be argumentative, but also, I've read dyno tests that clearly show that premium gas does in fact produce a little more power due to the controlled burn versus the "pop" of regular. We're talking micro-milliseconds here. (Is there such a thing as a micro-millisecond?)
 

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Running too high of an octane and you get incomplete combustion which means lower power output and the potential for carbon deposits.[/QUOTE]

The entire post is correct but the last point is important. And deserves repeating.

I noted in another thread that octane is basically a measure of resistance to spontaneous combustion under pressure. Has nothing to do with "improved power".

High compression engines require high octane fuel to avoid spontaneous combustion before the timed spark. What is commonly called pre-combustion or "pinging". Pinging is not good.

I owned a Guzzi that would ping like crazy with premium. Had to add Lucas Octane Booster to make it happy. Because it was an extremely high compression engine.

Same with airplane engines only more so. Thus AV GAS at 120+ octane.
Pilots term fuel for low compression engines as MO GAS (motor gas).
That would be us.

If you do not have a high compression engine you do not require high octane.
Stroms are not high compression.

If your engine isn't pinging it is happy. If it pings on regular gas I would look at timing issues.
 

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...
If you do not have a high compression engine you do not require high octane.
Stroms are not high compression.

If your engine isn't pinging it is happy. If it pings on regular gas I would look at timing issues.


My DL1000 is 11.3:1
2 spark plug heads. Newer bikes run leaner than ever.
Incomplete combustion isn't an issue to worry about IMO.

Suzuki says to run high octane.

I'm going with premium unless I can't get it for some reason and then I'll take it easy on the throttle. Premium is about a $1.50 more per tank right now in my area.
 

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I’m surprised people are recommending octane lower than the manual states.

The vee2/3 is a torquer. I would not run 87 octane without changing my driving habits, which would have to include not leveraging low end torque effectively.

Slow vs fast burn after auto ignition, and the topic of incomplete combustion, is something I hear repeated in forums all the time. It’s a myth.

The only difference between low and high octane is the gas’s ability to withstand pre-ignition. Meaning igniting outside the spark induced ignition. If you have an engine tuned for low end torque, and the manual says to run 90+... do exactly that.

In a pinch, sure. Just modify your throttle and shifting inputs to mitigate the risk.
 

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I’m surprised people are recommending octane lower than the manual states.

The vee2/3 is a torquer. I would not run 87 octane without changing my driving habits, which would have to include not leveraging low end torque effectively.

Slow vs fast burn after auto ignition, and the topic of incomplete combustion, is something I hear repeated in forums all the time. It’s a myth.

The only difference between low and high octane is the gas’s ability to withstand detonation. Meaning igniting outside the spark induced ignition. If you have an engine tuned for low end torque, and the manual says to run 90+... do exactly that.

In a pinch, sure. Just modify your throttle and shifting inputs to mitigate the risk.
Yes when using lower octane fuel than what your engine is designed for avoid large throttle openings at low revs where the effective compression ratio and risk of detonation are highest

In many cases higher octane fuels also have higher levels of cleaning agents which is a good thing.

..Tom
 
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