Why does higher octane burn slower?
Why does alcohol slow down the combustion process?
This text and many others say that Ethanol burns faster than gasoline.
http://www.fuelandfiber.com/Archive/...E85/age85.html
And this:
http://www.eco-flex.us/pages/myths.htm
3. Ethanol burns faster than gasoline but has a slightly longer ignition delay during the slow burn phase of combustion so the engine does not do as much negative work fighting rising cylinder pressures due to large ignition advances. The total ignition advance for E85 is almost identical to the ideal advance for gasoline so it does not cause the PCM problems when you mix them.
vershun 
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