I say that I save about $100/mo on gas, but I'm not really sure as I haven't driven enough regularly to know how much gas I'd use. It's a good number though. I probably spend that or more on bike gear too - ha! I don't track my spending on bike stuff. Bicycle dollars are not that same a real dollars.

I do have quite a lot of high quality bike gear and clothes that I got at yard sales or thrift stores for a dollar or so. I rarely pay retail for gear.