Since I don't have to buy a newer motor vehicle, I've eliminated having to make loan/interest payments for the next several years. By having an older vehicle, insurance and licensing fees are at their lowest, and with the lower driving miles comes lower maintenance and fuel costs. I was always a fan of eating lots of food, so the food bill is close to being the same, though I suspect it is lower since using the bike and not the SUV, I've learned to eliminate frivolous trips to the grocery store or fast food restaurants that otherwise would have been an easy jaunt by motor vehicle.
I didn't save very much money over the past few years since I used most of those savings to upgrade my bicycle fleet and cycling gear, but at least I have something more to show for my money spent than just a hand full of gas receipts.