Is the Avis / ZipCar Acquisition Green?

I am selling my little Honda in California, since I moved to Texas two years ago, I left a car in San Francisco to drive when I’m here.

So I’d been looking into getting car share.  Absolutely loving the concept, been trying to figure out if it is a better deal for me than renting when I come out.

So when Avis dropped half a billion dollars on ZipCar, I was pretty intrigued.  Which raised the question, does this count as a cleantech or green exit?

I mean, I’ve rejected the “IT services instead of flying argument” making web conferencing services a product green, something I used to get emails on from marketers all the time.

Zipcar’s a little like that.  Are fewer miles actually driven?  Less gas used?

How about fewer cars bought?  Is Zipcar actually replacing cars?  Or adding cars and increasing miles driven by bringing new drivers into the fleet, or making some time drivers into more of the time drivers and reducing public transit use?  I’m not sure that car rentals like Avis don’t increase the number of vehicles and maybe even miles per person in the US.

When does efficiency and better shared services instead of capital expenditures become green, and not just a good deal?