Lithium batteries need a couple of cranks to actually warm up the battery then they provide closer to normal temperature cranking amps. Just one of the downsides to the long storage charge they have and light weight.
Ethanol attracts water vapor and if it sits will separate. At that point it is an issue in very cold weather, but not an issue if you are going through at least a tank a month. Just short term 30 degree temps are not likely to cause an issue with water in gas freezing. So highly unlikely ethanol has anything to do with it.
Rusty Myers - Austin, TX
2009 BMW R 1200 GS Adventure
2013 BWM K 1600 GT