I agree... all should be considered. Tires, I believe, was considered as part of the operating costs. I didn't mean to completely discredit the ownership costs either (insurance, mileage, etc.)... what I was getting at was the reports (from what I could tell) seemed to be considering the total cost of ownership, not just how much of that total relates to the actual commute to and from work.
But all in all I have to agree... it would probably come out to be close to the same, at least if you have to pay for parking as well. If the company you work for provided parking for you, it would probably be a slightly different story. (I have never worked downtown full time, so I don't really know how it works)
I, too, am a believer that this could work... I just hope the people take the opportunity to make it work. I have a feeling many are going to have a hard time getting out of their cars when the cost is basically the same. Most people probably won't factor in the less stress, more enjoyable commute part.
EDIT: Oops.. I guess I got this in before Dave's edit, so now I'm replying to an imaginary post It's all good though lol