Originally Posted by CBBaron

The Schwinn looks like a pretty decent bike. A more expensive bike like the Madone is not going to be significantly faster unless you are doing alot of climbing (More expensive bikes are usually lighter). However a fast recumbent like this:

Bacchetta Strada
or this:

Challenge Fujin
Could make a couple MPH difference on a fast commute.
As always fitness levels make the biggest difference.
You can also try riding with aero bars which may improve your time some.

Craig

[edit] looks like Doug5150 beat me to the recommendations.