2006 Audi A4 S line Quattro Turbo 6 speed.  It's been tuned by APR to make an additional 50 HP and 90 FT LBS at the tires.  I'm spoiled forever.  No one screws a car together better than Germany.  When the lease is over I'll have a hard time giving it up!   I think an A6 is in my future =o)
MPG: 31 Highway.  29-30 MPG at 85+ MPH  Impressive!

UPDATE:  Lease ended in Jan. 2008 and I bought an A6!

2007 Pathfinder.  (We needed something to tote the baby and greyhounds around =o)  Nissan has always made a great ride.  22 Hwy MPG.  Not too shabby.

2003 Cobra (sold).  Featured in Mustang Enthusiast magazine and was tuned by myself and David Caine at Superchips Inc in the 03 cobra tuning pioneer days. 
Went from a 12 second car to an 11 second car to a 10 second car.  It remained a daily driver throughout. 
Last time it was on the dyno it made 590+ RWHP
MPG:  No Comment =o)