There was one of these back where I used to live with smoothies on it. It was pretty sweet looking, but I never got around to talk to the owner about whether they did it for looks, style, something else, or just to get better aero.
That winglet might not be quite as horrible as many suspect, although I doubt it's helping the matter at all.
If you're looking to go all out aero-modding, starting out with a belly pan will help you with noise, aero drag reduction, and keeping the underside of your (still fairly new) ride clean!
Assuming you're still making payments on it, you'll obviously want everything you do to be reversible, at the least, and still have a decent impact, right? Good! Mod the driver!
Go through the list of
100+ Hypermiling Tips and see what you can do for YOU!
Welcome to EM, and happy modding!