E85 (or E70 winter blend) has starting issues in the cold… So I’m told. My TA started no problem the other day near 0* after sitting for 3 months with old 80% ethanol in the tank.
Also if he has 2 toons, one for 93 octane and the other for E85 he may not use the ethanol in the winter due to the change from E85 to E70. Car would run very rich and would throw codes for rich condition as the computer may not be able to alter LTFTs enough to return to stoich. Just because he runs E85 doesn’t necessarily mean its Flex Fuel