ktm jeff Posted June 17, 2017 Share Posted June 17, 2017 Unless you have a high compression / tuned engine , 91 octane fuel will be fine if its E 10. Other wise use 95 octane E 10. I would prefer not to use E 20 for the reasons ive tried to explain above. If your riding off-road and have no choice , then OK. Just top up with 91 or 95 E 10 when you can. Link to comment Share on other sites More sharing options...
Gary A Posted June 18, 2017 Share Posted June 18, 2017 For an engine designed for E20, the compression is boosted to get optimal performance. That basically means that if you don't use E20, that engine will require 95 octane. If your engine doesn't require 95 octane that means your performance and economy will suffer using E20. Link to comment Share on other sites More sharing options...
bangkokairportlink Posted June 18, 2017 Share Posted June 18, 2017 If anybody could try to be a bit clear, this thread would be more useful :-) Link to comment Share on other sites More sharing options...
ktm jeff Posted June 19, 2017 Share Posted June 19, 2017 21 hours ago, bangkokairportlink said: If anybody could try to be a bit clear, this thread would be more useful :-) Theres only so far one can "dumb down" an answer. Sadly , it seems , you are below this level , by a good amount. Link to comment Share on other sites More sharing options...
bangkokairportlink Posted June 19, 2017 Share Posted June 19, 2017 Yes I must be stupid or nobody has been able to clearly explain what s the difference between 91, 95 and E20. Talking about octane number of 91 and 95 but not of E20. But I understand that you also don't know. Just wondering why you are pretending. Link to comment Share on other sites More sharing options...
sometimewoodworker Posted June 19, 2017 Share Posted June 19, 2017 (edited) 5 hours ago, bangkokairportlink said: Yes I must be stupid or nobody has been able to clearly explain what s the difference between 91, 95 and E20. Talking about octane number of 91 and 95 but not of E20. But I understand that you also don't know. Just wondering why you are pretending. Ethanol doesn't have an octane. However E20 is usually sold as having a rating of equivalent to 95 octane, though in a report gave PTT blue Gasohol E20 collected from September 2011- February 2012 as minimum and maximum RON of 98.4 and 99.3 (RON) = Research Octane Number you will use about 5% extra or more E20 for an equal distance than pure petrol Edited June 19, 2017 by sometimewoodworker Link to comment Share on other sites More sharing options...
canthai55 Posted June 20, 2017 Share Posted June 20, 2017 (edited) Ethanol Blend E0 E10 E15 E30 Octane rating (anti-knock index) 87.4 88.2 92.6 94.4 Research octane (RON) 90.7 92.4 97.8 100.7 Edited June 20, 2017 by canthai55 Link to comment Share on other sites More sharing options...
canthai55 Posted June 20, 2017 Share Posted June 20, 2017 Extrapolate E20 from the table above http://www.eesi.org/papers/view/fact-sheet-high-octane-fuels-challenges-opportunities Link to comment Share on other sites More sharing options...
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