EPA mpg estimates: 25 city/37 highway/30 combined Base engine: 2.2-liter, four-cylinder Starting price: $16,335 Annual fuel cost: $1,965 Beneath some styling changes and a higher base level of trim and equipment, the Pontiac G5 is close kin to the Chevrolet Cobalt, built on the same platform in the same factory. Enhancements for 2009 include Bluetooth connectivity and a USB port. A new four-cylinder engine produces 7 hp more than the engine it replaces, but with slightly better fuel economy. The G5 is a slow seller vs. the Cobalt, perhaps because customers expect higher-performance models from Pontiac.