About 2010 Chevrolet Cobalt Chevrolet Cobalt returns for 2010, with an efficient lineup of XFE, LS, LT and turbocharged SS models. The XFE is rated at 37 miles per gallon on the highway; the LS and LT models are rated at 33 mpg on the highway and the high-performance Cobalt SS delivers 30 mpg on the highway. The Cobalt SS is powered by a sophisticated 2.0L turbocharged and intercooled Ecotec engine that uses direct injection technology to deliver its balance of performance and fuel efficiency. Changes for the 2010 Cobalt lineup include exterior and interior color revisions. What hasn't changed, however, is its customer-focused package of choices, convenience and safety features that many other competitors can't match -- including Bluetooth wireless phone connectivity and an iPod-compatible USB port in the radio. Variable valve timing added to the 2.2L Ecotec engine enables efficient performance with horsepower of 155. Helping to maximize fuel economy is a new 3.63 final drive ratio for the manual transmission and 15-inch low rolling-resistance tires. Available in coupe and sedan body styles, Cobalt features smooth and sleek exteriors with fast rooflines. A myriad of subtle details, such as aircraft-style doors that integrate the door frames into the exterior surface for a tighter, flush fit, contribute to Cobalt's overall feeling of strength and solidity. A sporty look is achieved with a low-slung body and a curvaceous roofline.