Well, 90-10 is better, but come winter you're going to have to use 100-?. You should look into alternative charging networks. Even 120v for 9hrs at work is some benefit, and could be the margin you need.There is nowhere to charge. My home and work are exactly between 2 Superchargers. It is an extra hour of driving to go charge for 5 minutes at a Supercharger.
I know it isn't ideal for the battery but it is going to be used a lot more than most I have heard here....
Put your commute into ABRP, abetterrouteplanner, and figure out the best strategy.