There is more than one way to skin the cat - apologies to all crazy cat ladies out there.
Bike - 2008 Specialized TriCross Comp, purchased second-hand for $1400, came fully set-up for commute, fenders, pedals, computer and front and end racks.
Commute - 30 mi RT across downtown Orlando.
Vehicle - Pontiac Aztek (before you say anything, I have heard it all already). 22 mpg average.
After 9000 miles, gasoline vs. purchase price plus maintenance - I just broke even. IRS mileage reimbursement minus purchase price - I made about 3K. Carbon footprint - about 1 ton of carbon emissions saved (not that I give a d@mn, I save Mother Earth for a living 9 to 5 at my desk). NOT purchasing a third car for my oldest and NOT paying teenage-rate insurance for a full-time driver saves about $550 a month. Being in good mood after a ride and NOT biting off family's or co-workers' heads - whatever it is worth to you.
Good Luck
SF