The nascent business model got a huge shot in the arm today, in the form of $13.7 million of funding for Wheelz, a car sharing program based on college campuses. Zipcar, of course, is the 800 ...

Some numbers thrown out by the company are: Zipcar members save $435 a month vs. owning a car; each Zipcar has the effect of taking 20 privately-owned vehicles off the road.