Having replaced Saturn’s L-Series, the Aura has been set loose to do battle in the tough midsize-sedan segment. For 2009, Saturn has improved the Aura’s fuel economy, but will that be enough to make it competitive? Cars.com’s Mike Hanley offers his views on the Aura, which now has a hybrid version and a more fuel-efficient four-cylinder. Read his full review to find out if Saturn’s sedan is worth a look.