Curious to know how ethanol gasoline and all the additives effect power. Lets pretend that we have 92 octane gasoline. One brand is pure gasoline, the other is the standard 10/6% ethonal blend with whatever additives that are found at the pumps. IF you put this into say a yz450 or a 250 two stroke and ran it on the dyno comparing one bike using two different gasolines, would there be a power difference? I think I'm trying to find out if ethanol saves on smog at the cost of power? Does ethanol have any kind of anti knock capabilities in OUR dirt bike engines? I searched and couldn't find an answer to this, lots of threads about ethonal and how it sucks, attracts water, how to remove, etc, but nothing comparing if it effects power to regular gasoline.