Luxury Vehicle
Mercedes-Benz E320 CDI
Mileage: 27 city/37 highway
Cost: About $50,000
Photos and details

The E-class is a really good all-around luxury sedan. With an optional high-mileage diesel engine, it also gets genuinely impressive fuel mileage.

Unfortunately, due to environmental regulations, the diesel E320 is not available in all 50 states.

Also:
Audi A4
BMW 3-series