Gasoline: premium vs regular - Page 2 - Suzuki Volusia Forums : Intruder Volusia and Boulevard Forum
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post #11 of 95 (permalink) Old 08-03-2013, 07:50 AM
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Manufacturer says 87. Do the math on 89 or 91 getting better gas mileage vs. $$ spent on each. Let me know how that works out. If you live in a low humidity part of the country do the 87. I personally run Non-ethonal I have first hand experience with that crap here Florida in my outboards and lawn mowers. Cost more and poor gas mileage but it beats the aternative. The bike doesn't sit long enough to be effected but I'm taking no chances.

I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.

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post #12 of 95 (permalink) Old 08-03-2013, 09:09 AM
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Mine gets better mileage with regular octane. Dunno why but it does.

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post #13 of 95 (permalink) Old 08-03-2013, 09:36 AM
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I run either 87 or 91 depending on where I need fuel. I can get 87 pure gas in the town I work out of. However, I have to bump up to 91 in the town I live in. I also have a fuel mileage app on my phone. The bike does seem a little more responsive on the 91, but overall mileage is better on the 87. In other words, 6 of one, a half dozen of the other.

One more quick note, if I'm forced to get the evil (ethanol) fuel I go premium 93 every time. But I do try to plan my trips better whenever possible.
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post #14 of 95 (permalink) Old 08-03-2013, 09:51 AM
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I put in 87 and it works just fine. I also make sure it has ethanol in it too. Why, cause I don't care. There is no reason to run 91 or higher in this motor. If your going to do that, then put some 110 octane in there. It should go like a rocket after that.

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post #15 of 95 (permalink) Old 08-03-2013, 12:04 PM
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Originally Posted by bendbolden View Post
Mine gets better mileage with regular octane. Dunno why but it does.
'Cause that's the way it was designed.

I know you believe that you understand what you think I said but I'm sure you realize that what you heard is not what I meant.

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post #16 of 95 (permalink) Old 08-03-2013, 12:19 PM
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Originally Posted by SmokinMr2 View Post
Higher octane, low compression engine flux capacitor bla bla bla...

You can run the cheapy old regular ... unless you can't.

We have an 05 C50 and C90. They get top tier premium in the highest octane we can get out here in California. We do brew our own fuel here though.

If they get the cheap 87, Arco, etc. they run like crap and get awful mileage.

Somewhere around here I posted the owners manual and the repair manual pages...the ones that say octane of 91

But that was years ago during the first "what kind of fuel" war, which I think was right after the "what kind of oil" war...

Found this as posted by "id-man" in another gas thread. Interpretation is wide open I think.




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post #17 of 95 (permalink) Old 08-03-2013, 12:22 PM
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I have ran 2 tanks of 91 Octane through my 08 C50T and I averaged 38 MPG. It ran fine on the hiway, but not as good around town. But that could be because it needs tuned.
My next 2 tanks are going to be regular 87 Octane and I will see what the difference is in mileage.
Different engines will run better or worse with different fuel octanes. How it's tuned, air temp, humidity, elevation, your riding style will all make a difference. Your bike will get different MPG from day to day.
Not to get off topic, but I had a 90 Geo Metro that would vary almost 4 MPG depending on what Octane fuel I would run through it from the same gas station.
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post #18 of 95 (permalink) Old 08-03-2013, 12:31 PM
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when i can i run 91 as it is the only gas in my area without the ethanol crap in it. I always use non ethanol when put away for the winter. very few stations have it in my area. But out on the road anything to keep me from running out so i can get back home.e
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post #19 of 95 (permalink) Old 08-03-2013, 01:35 PM
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Originally Posted by lioness View Post
I have always used premium gas in my bike so far.Does anyone have an opinion on how this could effect my ride ?..looking for pros and cons.
Octanes are a family of hydrocarbon that are typical components of gasoline. They are colourless liquids that boil around 125 C (260 F). One member of the octane family, isooctane, is used as a reference standard to benchmark the tendency of gasoline/petrol or LPG fuels to resist self-igniting. In a normal spark-ignition engine, the air-fuel mixture is heated due to being compressed and is then triggered to burn (relatively) slowly by the spark plug and ignition system. If it is heated and/or compressed too much, then it will explode when triggered (detonate), or even self-ignite before the ignition system sparks. This causes much higher pressures than engine components are designed for and can cause a "knocking" or "pinging" sound if light, or major engine damage if severe. This can break connecting rods, melt pistons, melt or break valves or other components. The octane rating is a measure of how resistant a fuel is to spontaneously or explosively ignite under such conditions. The higher the number, the more resistant the fuel is. Engines that have aggressive designs (high compression pistons, high intake density and/or temperature) or unusual operating conditions (low-speed, air-cooled engines such as small aircraft) require higher octane fuels.

Isooctane (upper) has an octane rating of 100 whereas n-heptane has an octane rating of 0.


The most typically used engine management systems found in automobiles today have a knock sensor that monitors if knock is being produced by the fuel being used. In modern computer controlled engines, the ignition timing will be automatically altered by the fuel management system to reduce the pre-ignition to an acceptable level.
The octane rating of gasoline is measured in a test engine and is defined by comparison with the mixture of 2,2,4-trimethylpentane (iso-octane) and heptane that would have the same anti-knocking capacity as the fuel under test: the percentage, by volume, of 2,2,4-trimethylpentane in that mixture is the octane number of the fuel. For example, petrol with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90.[2] A rating of 90 does not mean that the petrol contains just iso-octane and heptane in these proportions, but that it has the same detonation resistance properties. Because some fuels are more knock-resistant than iso-octane, the definition has been extended to allow for octane numbers greater than 100.
Octane ratings are not indicators of the energy content of fuels. (See section 4 of this page and heating value). It is only a measure of the fuel's tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner. Where the octane number is raised by blending in ethanol, energy content per volume is reduced. Ethanol BTUs can be compared with gasoline BTUs in heat of combustion tables.

A US gas station pump offering five different (R+M)/2 octane ratings


It is possible for a fuel to have a Research Octane Number (RON) more than 100, because ISO-octane is not the most knock-resistant substance available. Racing fuels, avgas, LPG and alcohol fuels such as methanol may have octane ratings of 110 or significantly higher. Typical "octane booster" gasoline additives include MTBE, ETBE, isooctane and toluene. Lead in the form of tetraethyllead was once a common additive, but its use for fuels for road vehicles has been progressively phased-out worldwide, beginning in the 1970s.

The above from Octane rating - Wikipedia, the free encyclopedia

The above explains Octane rating Regular Octane vrs High Octane. Try different octane ratings and use the one you like I use regular it works well for me.

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Last edited by Two Red Ryders; 08-03-2013 at 01:40 PM.
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post #20 of 95 (permalink) Old 08-03-2013, 02:19 PM
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I use 89. The C50 does not need 91. 91 are usually for performance engines that have a higher burning rate. My Jetta GLI requires 91.
87 is [email protected] gas. Stay away from it as much as you can. It'll run fine, but if you want your engine to last many many years, take care of it.
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