I'm starting to car shop. Mine is 10 years old, 150k miles and hers is 5 years old and 50k miles. Currently I drive a Chevy and she has a Nissan. Her daily commute is about 35 miles round trip. Could be less if she takes a new job closer to the house. And I work from home 3 days a week, but I can travel upwards of 60 miles for meetings or if I need to go help my Dad with something (40 miles one way).
We are seriously looking at the Volt. With the current tax credits, the price of the Volt is in line with say a Cruse Eco or Malibu Eco. Plus most days we probably wouldn't need to use the gas engine, but if we did it would go the extra distance no problem.