Check your air filter, and oil. Also, you said you're less than 10 miles from work, but you could still try to beef up the PSI in your tires. I run mine at 45....did it at 50 for a while but noticed a lot of pre-mature wear so i aired down a little.
CAI, Exhaust, and Tuner will help, but you're looking at an extra 2 mpg at best i would think (personal experience)
Hope that helps