The Saturn Aura also gives buyers four engine choices. The four-cylinder XE has a 169 horsepower, 2.4-liter Ecotec engine. The six-cylinder XE has a 219 horsepower, 3.5-liter V-6, and the more powerful XR boasts a 252 horsepower 3.6-liter V-6. Finally, for the environmentally conscious, the fuel-saving Green Line Hybrid has a 164-horsepower, 2.4-liter engine. Both XE models are paired with a four-speed automatic transmission, while the XR comes equipped with a TAPshift six-speed automatic transm...