Re: buying new car - good on gas
Of cars currently on the market, I think I'd say Mazda 3 too.
Unfortunately in the U.S. market the options for a 5 door car (for reasonable $) are limited:
Hyundai Elantra GT
VW Golf or GTI (next gen of this coming sometime in 2014 and worth waiting for IMO)
'14 Durango Limited AWD Deep Cherry Red
'05 Yukon XL Denali
'67 Corvette Stingray