The Saturn Aura XE comes with a 224-horsepower 3.5-liter V6 attached to a four-speed automatic that the EPA says it will get 20 mpg in the city and 29 mpg on the highway. Upgrade to the Saturn Aura XR and you’ll get a 3.6-liter V6 with a six-speed automatic and paddle shifters. This more sophisticated and stronger powerplant makes 252 horsepower on regular unleaded, and gets a rating of 20 mpg in the city and 28 mpg on the highway. During our first drive of the Aura XR, we achieved 20.3 mpg on a good mix of roads.