Using a 2.4-liter four-cylinder engine with variable-valve timing and 173 horsepower, the 2007 Pontiac G5 GT offers decent throttle response and plenty of power for all types of driving. Our tester was charged with transporting three grown men, along with their briefcases and assorted camera equipment, to and from LA while under our care, and not once did the little Pontiac falter. With the go pedal firmly planted against the floorboard when attempting to merge with highway traffic, the G5 GT performed admirably without any hesitation or lack of power, all while averaging 23.9 mpg. Sure, the four-banger was a little raspy, but it wasn't horrible. The same can be said of the automatic tranny, which offered relatively smooth shifts.