My costs range from $400 a mile to less than $0.002 a mile. The higher price is on a bike that have been working on but haven't ridden yet. The low price is on a 1970 Raleigh Sports Standard that is still rolling along after tens of thousands of miles (35,000 documented, probably over double that for total mileage) it has had nothing but basic routine maintenance done to it using the least expensive parts available. Typically what could be found a the local hardware store, K-mart or Wal-Mart. I basically tripled the value of the bike this year by installing a new basket and some dyno lights, all of which were pulled off of other bikes.
Aaron