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I don't have the concourse but in my zx14r as well as my2000 zx12r I always alternate between the high and low octane. No problems to date on either bikes, but I do notice better mileage with the low octane in the12r. I don't have enough miles on the14r to know mileage differences yet.

Lou
 

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I don't think you'll notice a difference, I've run fuel so sorry, that it makes a Hardley sound like the 4th of July, with no problems in a ZX14.
 
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