Just to put some of these numbers in perspective:
I have an '03 VW Passat wagon, bought new, that is now approaching 100,000 miles. Taking into account maintenance and gasoline (not purchase price or depreciation), the per mile cost is approaching $0.23. It's a high maintenance car - turbo engine eats premium fuel and requires synthetic oil. I'd compare it to my bike, but it's too new with too few miles on it to be meaningful at this point.