Welcome to the site.
The Fiesta ST sounds like a very fun car, and it has a pretty decent highway rating. I'm curious though, the 2014 and 2015 EPA ratings are a bit higher than the 2016 rating. If I were you, I'd try to figure out what the difference is.
What is your normal commute like? We can suggest some mods based off of that. Or, did you have some planned already?