You are already driving the most aerodynamic Ford sedan ever made. (Cd 0.30) The antenna isn't in a bad place, but you could install a switch to control it. I once had a Caddy with a bad auto antenna that worked pretty well even when not extended. You mirrors aren't bad.
OMG! Take off those window visor things!
If you have a water temp gauge I would go ahead and try smoothing over the 3 openings in the front bumper with something like packing tape. Smooth over the front turn signals too. If you are handy you can make a wiper cowling that attaches to the rear of the hood. The problem is snow will pack in them.
Ahhh. Eibach makes lowering springs for your Taurus. 1.4" Lower is better, but it might knock you out of your SCCA class.
Good luck!
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