Join Date: Jun 2009
Location: N. Las Vegas, NV
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My backup 450R and 700XX I run 91 in, (Highest octane you can get at the pump other then race fuel.) while when I just go and test or play ride with my race 450R, I run straight 91, but when I race, I run a mix of 91 and 100. (There are a few places in town that sell 100 octane unleaded at the pump.) My race 450R is right at the limit of pump gas, but due to the length of the races, I feel better running a little higher octance. It is hard to explain, but my race 450R does run better on the 100/91 mixxed stuff. Does nothing for power, but it just seems to be "crisper", not really sure how to explain it. I have ran left over mixxed fuel in my back up 450R also, and have noticed the same difference.
My only explaination is the 100 octane is "cleaner". The normal pump gas around here has alot of additives in it, and the 100 does not, so that is my reasoning why it runs better. All the pump gas in Vegas comes from California, so who knows what kind of stuff they put in it to fight smog. (the 100 is from a local fuel supplier.) Granted, I am not running straight 100, so there is still "dirty" 91 in there, but just half 100 makes a noticeble difference. I have ran straight 100, and do not feel any difference between straight and mixxed. I guess just some good fuel is all it takes to fight off the bad fuel!
If you went and fueled up one of my quads with either 91 or a 91/100 mix and did not tell my what you filled it up with, after I rode the quad, I could tell you, it really is that noticeable. If I could afford it, I would run nothing but mixxed stuff, but it does get a little expensive.
2004 TRX450R, 2008 TRX700XX
(BITD #639 Quad Ironman Expert)
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