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The 2009 Pontiac G5 receives a more efficient and more powerful 155-horsepower 2.2-liter Ecotec 4-cylinder engine with variable valve timing. Expected to achieve 37 mpg on the highway via a new final drive ratio and 15-inch low-rolling-resistance tires, the G5’s newt features include a Bluetooth wireless phone connection and an iPod-compatible USB port for the audio system.