The ethanol absorbs any water and stops it from separating out. If the water separates out it can freeze in the fuel line and cause a blockage. In my part of C

The ethanol absorbs any water and stops it from separating out. If the water separates out it can freeze in the fuel line and cause a blockage. In my part of Canada people were actually somewhat happy when the 10% ethanol showed up as it meant that you didn't have to add any fuel line antifreeze over the winter.