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Although a bit more expensive, I find a Non Ethanol, gives me about 7-10% better. So it's a wash RE cost per mile, but I do get a 7-10% better range per tank.
 

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There will be so many answers to this. In my testing, 87 Regular is the best bang for the (4) buck. Others have said premumn is better but I lost about 2 MPG over Regular.
 

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I use the kind of gas that burns well and clean - 87 octane
 

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The bike will run fine on any good quality 87 octane fuel. I have found that mine seems to do best on non Ethanol fuel when I can get it. It gets slightly better mileage and has a little more power. There are several stations in my area that have non ethanol (lot of boating in my area and Ethanol is a no-no in them) I don't fret over it if I'm low and none close. In that case I will use Sta-bil or Sea Foam, especially if it is going to sit for awhile during the off season. I usually keep a 5 gal Gerry can in the garage for use in smaller engines like weed trimmers , mowers etc.
 

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Another thing to remember is the higher the elevation, the lower the octain requirement. So in Denver CO or higher you may find they have 85 octain. That is OK for that elevation. I remember a test was done many years back where a car was run at over 10,000 feet above sea level. They ran it on the low octain for the area and then the High Test for the area and the MPG went down a bit. Then the ran it on sea level's 94 Octain and it got very much lower MPG. The test also did the run at sea level and the car ran very badly on the high altitudes low octain but got the same MPG on the high altitude high test as low altitude regular. :fart:Bad gas.
 

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I have another thought regarding "the best fuel". I recall that I once bought a fancy pants, hi performance car and of course it required fancy pants fuel! What I discovered was that I was unwittingly pumping watery dirty fuel into my tank, fump filter, fuel rail and eventually injectors. How did this happen you ask? Well the gas was so darned expensive that no one bought it besides my dumb self. It sat and sat in the underground tank absorbing God knows what waiting for the moment I liberate it from it's underground ****.
So, the lesson I learned was to buy the cheapest gas from the busiest station you can find and be reasonably assured that the gas you are getting is fresh, clean and water free.

Ed
 

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I have another thought regarding "the best fuel". I recall that I once bought a fancy pants, hi performance car and of course it required fancy pants fuel! What I discovered was that I was unwittingly pumping watery dirty fuel into my tank, fump filter, fuel rail and eventually injectors. How did this happen you ask? Well the gas was so darned expensive that no one bought it besides my dumb self. It sat and sat in the underground tank absorbing God knows what waiting for the moment I liberate it from it's underground ****.
So, the lesson I learned was to buy the cheapest gas from the busiest station you can find and be reasonably assured that the gas you are getting is fresh, clean and water free.

Ed
And then there's that. ^^^^
 

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the lower octain i can get here is 93, i usually use 95 and think the mpgs are good enough.
 

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the lower octain i can get here is 93, i usually use 95 and think the mpgs are good enough.
Octane is measured by a different method in the US than it is there. From what I can find Chile uses the RON method. The US uses the AKI method. 87 octane measured with the AKI method is the same as 93 measured with the RON method.
 

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I don't think the 650 engine is designed to take advantage of the higher grade octane fuels.

When I first got my 04 std 650, I ran some tests, ran 87 octane for two straight weeks, same pump same gas station. Repeated the same for two weeks using the mid level octane and then the super octane.

In the end I didn't see any difference in terms of performance or MPG, granted the higher octane may have some other benefits as far as the fuel injection and other stuff goes but I am not an expert in that regard.

I have been running 87 octane every since and my MPG and performance has change at all over the years as I keep a meticulous fuel log.

Spend your money the way it makes sense to you and do some due diligence research on what those fuel octanes mean and what they are intended for.
 

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I run the cheapest 87 octane I can find which is $3.759 today.
 

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