<prompt> Human: EDIT: From the feedback, I decided to estimate vehicle weartear and depreciation from mileage.Additional information: the fact that the bus I ride is hybrid, routine weartear maintenance oil change, tires, brakes, air filter, transmission flush, and the KBB value difference for my car if it had its current mileage vs. if it had the additional mileage from commuting.All told, the cost savings over 8 years is 8222 and the total CO2 emissions saved is 33 tons. Wow!The cost savings again over 8 years breaks down into 3513 routine maintenance, 2709 saved buying bus passes vs fuel costs, and 2000 in increased KBB valuation from the mileage saved.  <response>: It depends on your route on whether this is feasible. With my girlfriends commute, it makes so much sense to use the metro, 15 minutes, 6 stops, bam but driving would take an hour. For me, it would take 50 minutes, 11 stops by metro and 15 minutes by car. Opportunity cost should be factored in but if youre lucky enough where public transit is faster AND cheaper, thats awesome! 