Originally Posted by alect
my Audi A4 gets 28-32 on the highway - I don't find these all that green!
It's not just the mileage -- it's also the emissions. A 2006 A4 with automatic transmission emits over 9600 lbs of carbon annually (assuming 12000 miles). By contrast, Mrs. CO FF's Prius emits 2500 lbs of carbon (and the stats aren't out yet on my 2007 Camry Hybrid). (See
http://www.terrapass.com/road/carboncalc.php for data based on specific year, make & model of your car.)
Granted, your A4 is cooler. But I'd gladly pay extra to rent a duplicate of my Camry Hybrid than some smog-belching Mercury Grand Marquis.