Unless you have no car at all riding a bike is no massive savings. If you still have a car somewhere that you drive with any regularity you are still going in the hole...in fact faster.

I spend way more on bike swag then I will ever save in gas. One of bike needs tires and its my nice bike so its getting $60+ conti's that will last 3k. My truck has 33x12.50's that I bought used for $350 and still have another 30k on them before I need to replace them and I already have drove 15k. crunch those numbers and see what savings of that? There is none, it will cost a LOT more to keep tires on that bike then the truck. It will cost me $2100 in tires on the bike to go as far as the $350 set of tires on the truck are good for.