i realize this thread was last posted in almost a month ago, but I just received the U90 recall notice for my 2015 2.4L. I'll go have it done sometime in the next few weeks.
Not sure if it's just down to the hills in my area or what but I've never gotten better than around 20mpg for around town driving, more often in the 18.5-19.5 range - if i see any noticeable difference after the recall is done i'll post back.
i feel like i might have lost a small amount of efficiency for highway driving after the oil consumption recall, but couldn't say for sure.