Which octane

[DarkMonster620]

We only have available 91 and 95 oct...

[junior varsity]

which is why I think the measurement for octane is different where you are than it is here. RON (most common), or MON, or what we have in the US and Canada: AKI {which is the average of RON and MON: (R+M)/2}

RON is about 8-10 higher than MON, thus AKI is about 4-5 points lower than RON. So if you have 91 and 95, you might have what we could call 87 (regular) and 91 (premium...or 'almost' premium)

[DarkMonster620]

which is why I think the measurement for octane is different where you are than it is here. RON (most common), or MON, or what we have in the US and Canada: AKI {which is the average of RON and MON: (R+M)/2}

RON is about 8-10 higher than MON, thus AKI is about 4-5 points lower than RON. So if you have 91 and 95, you might have what we could call 87 (regular) and 91 (premium...or 'almost' premium)

ato,
we use the same method as in the US, R+M/2... the only 2 avalilable octanes 91 and 95...heard a rumor, 98 might be coming due to 'hi end' vehicles need for it...

[junior varsity]

That doesn't make sense to me. I'm in Dallas, pump gas doesn't go above 93/94...maybe 95 even in the part of town with all the crazy exotic cars (Highland Park 'hood).  98 wouldn't really even be considered "pump" gas, though its not race gas like Turbo Blue. To get 98, they'd have to either overhaul the stations or replace one of the tank's contents because its higher than the existing 'high grade'.

Another interesting element to add to this discussion is that most stations' only have like 2 underground tanks. "Low" grade (lowest octane) and the high grade (highest octane). Any intermediate grades is merely a combination of the two in the proper proportions.

[ducatiz]

That doesn't make sense to me. I'm in Dallas, pump gas doesn't go above 93/94...maybe 95 even in the part of town with all the crazy exotic cars (Highland Park 'hood).  98 wouldn't really even be considered "pump" gas, though its not race gas like Turbo Blue. To get 98, they'd have to either overhaul the stations or replace one of the tank's contents because its higher than the existing 'high grade'.

bro, travel some and you'll get the idea.  in south/central america they use the same octane method (R+M/2) but sell higher octane gas.  we were in anguilla for the summer -- lowest octane gas they sell is 95.  you get 95 or 98 and that's it -- 90% of the cars on the road there are tiny 1.0 l Daihatsus.  and there it is right on the pump OCTANE METHOD (R+M)/2

i don't know if they still sell the 85 octane in Colorado, I remember it when I was in college.

different markets sell different shit.

[jasaretta]

That doesn't make sense to me. I'm in Dallas, pump gas doesn't go above 93/94...maybe 95 even in the part of town with all the crazy exotic cars (Highland Park 'hood).  98 wouldn't really even be considered "pump" gas, though its not race gas like Turbo Blue. To get 98, they'd have to either overhaul the stations or replace one of the tank's contents because its higher than the existing 'high grade'.

Another interesting element to add to this discussion is that most stations' only have like 2 underground tanks. "Low" grade (lowest octane) and the high grade (highest octane). Any intermediate grades is merely a combination of the two in the proper proportions.

We have 98 RON at nearly all stations in Oz.

[ducatiz]

We have 98 RON at nearly all stations in Oz.

you need to read back

RON is not how octane is measured in the USA, it is the average of the RON and MON measures, typically represented as (R+M)/2 also called AKI. (anti-knock index)

98 RON would be around 95 or so R+M/2

[junior varsity]

I've traveled throughout central america, but never bothered to stare at the gas pumps, there's lots of others things for your attention to be on!

I just didn't realize that the vehicles down south needed that high of an octane, even with the heat. Doesn't mean a 2V duc with standard compression would need that much still.

[ducatiz]

I've traveled throughout central america, but never bothered to stare at the gas pumps, there's lots of others things for your attention to be on!

I just didn't realize that the vehicles down south needed that high of an octane, even with the heat. Doesn't mean a 2V duc with standard compression would need that much still.

when i drove straight down to panama, i noticed the gas.  i took my '71 VW camper all the way from memphis to the canal and then back.  the bus really loved getting some leaded gas, there was a noticeable difference.

heat is a factor affecting detonation.  it is probably easier to just stock the higher stuff year round, especially as you get closer to the equator.

insult to injury?  I haven't seen one pump in any of the Caribbean or central america with ethanol, lucky bastards.

[jasaretta]

you need to read back

RON is not how octane is measured in the USA, it is the average of the RON and MON measures, typically represented as (R+M)/2 also called AKI. (anti-knock index)

98 RON would be around 95 or so R+M/2

THanks....then Downunder have 91 95 and 98 RON so whats that about 89, 91 and 95

[Howie]

THanks....then Downunder have 91 95 and 98 RON so whats that about 89, 91 and 95

There is no exact numerical relationship, MON uses a test engine that has variable ignition timing and the engine runs at a higher speed than the engine used for RON.  The fuel is also preheated.  MON is actually more accurate for modern engines.  Your life should be easy, since the manual says use 95 RON and that is what you got.

[yoreese]

I have run a tank of Sunoco GT100 and the bike ran very crisp but I did notice the exhaust was very grey looking after a long ride. 

[DarkMonster620]

insult to injury?  I haven't seen one pump in any of the Caribbean or central america with ethanol, lucky bastards.

It's coming, I've heard...Why don't you ride down now...

Your life should be easy, since the manual says use 95 RON and that is what you got.

So I'm good with what I'm filling?

ato, we good?

[junior varsity]

Yeah, but I really think you could use the lower grade. Life is really complicated when you go to the local 7-11 and there are more than 2 or 3 grades. Like 6.

[ducatiz]

Yeah, but I really think you could use the lower grade. Life is really complicated when you go to the local 7-11 and there are more than 2 or 3 grades. Like 6.

seriously.  many of the Sunocos in Jersey have 87-89-91-92-94 -- why?  people are dumb.  plus the "per octane" price is highest at 91 if you do the math (price per gal / octane).  most cars don't need it but they feel like they are "treating" the car but not splurging... meanwhile, they over pay per gal...

be anal:  fill it half way with the top octane and half with the bottom.