If you want reliability into the mix along with the good gas mileage Id say stick with Honda or Toyota. Ive been getting close to 28mpg highway miles on my V6. You could get a Lexus ES, Toyota Camry or Avalon if you want four doors. The Accord would work too. Civics are good too, just the only problem is if you want to seat 5 people a bit more comfortably a civic will not work. I carpool with someone who has a civic and my head hits the roof and its pretty cramped int he back with two people in the back.
Subaru are good too.