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i'm buring regular 87 octane in the fit. my accord needs higher octane but that is primarily cause when the car was made regular was running higher octane..
Big Fit basicly if you have a older car the higher octane might benefit you.. otherwise no.. on the rotaries I don't know.. the one time I looked at them the sales guy was doing the it will burn and run on anything.. kerosene, white gas etc.. in a pinch.. (course probably just about anything will run on it in a pinch Ok maybe not a diesel engine.. but.. ) I'd just do a comparision.. run a tank of high octane then a tank of lower octane then a mixture.. see if anything changes greatly.. Sometimes it makes a difference, sometimes it doesn't, my older honda will climb one of the hills out here in 3rd on regular.. but it likes to knock doing it.. the fit on the other hand runs the same hill in fourth or fifth.. depends on if I had to slow down due to traffic part way up.. without knocking.
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