[COcyclist]

tylerc, Welcome, nice Beemer! The trunk lip probably is OK for reducing drag. The vortex generators usually get poor press on this site. The front bumper cover looks good to me, especially if you can block off/smooth the fog light holes because it does seem to cover the front tires a little more. Honestly, the biggest mileage gains will come from changing your driving habits. It's not flashy or macho but that is where you will see the biggest gains and it costs very little. If you are serious about better mileage and you don't have a trip computer with instant mpg, get a Scanguage II. It plugs right into the OBD II port and will show you where you waste fuel and where you can save. Once you have accurate temperature readings from the Scanguage you can do an upper grill block, inflate tires to max and coast in neutral when possible. Read all the tips on this site. If most of your commute is highway, you want to improve aerodynamics and/or slow down.