So, from spring break and then this past week, I've had A LOT of highway miles racked up on my just broken in Mustang. I've been very impressed with the MPGs I've been getting, and even got to do some 1/4 mile runs on these highways as they were out in the middle of nowhere. I'm very happy with a 13.3 from an automatic, running on 87 octane, with crappy 235 tires, and my wife in the passenger seat. Can't wait to try it on a track, with some 255 or 265s and 93 octane.