I also drain the fuel lines. This was a lesson learned from the service guys who told me it's absolutely necessary due to ethanol damage
Yeah I just found out about ethanol's effect on seals & gaskets & stuff. Can't believe there's not more uproar about it in the marketplace.
Ethanol blended fuel is really only bad for older engines and engines that spend a lot of time in humid environments (like boats). Otherwise, newer engines are designed to handle ethanol blended fuel just fine.