I have a distinct sense of Deja Vu reading this thread.
My 30+ mile commute car vs bike\mass transit comparison (simplified)
Car:
$300 payment
$100+ gas each month
Bike:
$50 misc gear or repairs each month
$50-$100 mass transit cost each month. It decreases in summer. More rides straight to and from work.
There is no point in expounding upon this further for my situation.