You are in fact saving money, not in the immedeate, but over a longer time spand. You are only thinking about gas, what about oil changes, lights going out, brakes wearing down? What about cataclysmic car breakdowns that cost between 600 and thousands!?!?
You are also investing in your health, believe it or not. When you become more active you will face less health problems statistically and have to go to the doctor less. In the 2 years I have been biking I have spent somewhere around $2500. This includes getting started and my first bike that I spent too much repairing because it was too cheap. Now that I have all of the expensive stuff taken care of I only have to repair tires, chains, cogs and batteries in lights ;-).
Feel excited about your new gizmos, its always nice to get new equipment