Whats a carburetor?

 

Running 10% ethanol gas will result in lower gas mileage.&nbsp\\; Ethanol has a lower energy content than gasoline (23.5 MJ/Litre compared to 34.8 MJ/L for gasoline), therefore the post-burn oxygen content in the exhaust would be lean (all things being equal).&nbsp\\; The bike's EFI will increase the fuel in order to achieve the same F/A mixture, which lowers your gas mileage.