ethanol fuel mixtures and horse power.

i have noticed in the past few months that my bike, a 2006 zx10r has been running strangely. someone mentioned that almost all gas stations in my area, and most in the country now run E10. A  90% gas 10% ethanol mix.  sure enough when i went to fill up the next day i saw a sticker on the pump that stated the fuel contained  10% ethanol. i did some research and found a fuel station  by my house that still sold 100% gasoline. i filled her up and the bike ran great. very noticeable deference. after some reading online i found out that ethanol has about 37% less energy than gas. so theoretically this could affect horsepower. i have has a hard time finding any real info on this subject. although i did read that drivers where getting up to 7% less fuel millage on E10. this is also something that i noticed with my vehicles. anyone have any real date on this?  

zxbrian
    I have found in the past that my bikes here in the midwest liked the ethanol in the fuel. Remember, it takes twice as much alcohol to burn as gas. Your mileage will go down but if jetted correctly the engine will handle more Comp. ratio and/or spark lead. You will find more power.
    We found this out years ago on our motors in the Micro Sprints. Admittedly we we using Methanol but in this case I think apples are oranges. PS Alcohol and aluminum don't mix.