Tucson GLS and Limited models feature the Theta II 2.4-liter DOHC inline four-cylinder engine. The Theta II is rated at an estimated 176 horsepower and 168 lb.-ft. of torque. This high-tech, all-aluminum, 16-valve engine features CVVT on both camshafts and a VIS for better engine breathing. In the green states, the 2011 Tucson GLS and Limited models are certified as Partial Zero Emission Vehicles (PZEV) which means they are as clean as many hybrids. Tucson GLS and Limited boast an impressive estimated 22 mpg city/32 mpg highway fuel economy rating with the six-speed automatic transmission with SHIFTRONIC® and FWD. Tucson GLS models also now feature Low Rolling Resistance (LRR) silica tires to contribute to the outstanding fuel economy. With AWD, Tucson delivers an estimated 21 mpg city/ 28 mpg highway exceeding competitors’ AWD versions.