So I've been doing a lot of research lately, and I wanted to bounce a few ideas off some of the older and wiser folks of this forum. Long story short, does ethanol free gas make more power than e10 fuel running on the same tune?
I don't know, seems like I can't find any dyno results of someone running back to back runs, same exact tune and conditions, with the different fuels.
The pros of ethanol in fuel is that it's a natural octane booster which allows for more ignition timing which in turn can create more power, when tuned for it. But most motorcycles are tuned to run on 87-90 octane, and usually they prefer ethanol free gas (yet run on e10 anyways) wouldn't it make sense that they would make more power with 100% gas? What has my attention is that since the fuel by me is 10% ethanol by volume, and ethanol has 33% less energy by volume, technically my fuel has about 3.3% less energy in it per gallon than pure gas would. The EPA confirms this by claiming that using e10 will net a reduction of 3% less mileage in a vehicle. Is this a result of the fuel burning with 3% less energy? Is it wrong to assume you could gain about 3% power from running E0 fuel?
I found this article from 2012 published by Motorcycle Consumer News, explaining how easy it is to remove ethanol from pump gas on your own. http://www.ssegal.com/files/Ethanol.pdf
According to this article, it wouldn't take much time at all out of my day to be able to make it. It is stated that removing the ethanol from the fuel will lower the octane rating about 2-3 points, but that does not concern me too much, as if I start with 93, then reducing it to 90 still leaves a hefty margin of safety to what is safe to run in modern motorcycles. This would mean I wouldn't have to worry about adding back in an octane booster to safely burn the fuel, so cost wont be an issue either.
Obviously financially it makes no sense to run straight gas for commuting as you are losing 10% of the fuel by removing the ethanol, but if you were planning on going out for a ride or a track day, removing a little bit of gas to net a 2-3% power gain sounds like a pretty sweet deal to me.