IT SAYS THAT YOU CAN USE REGULAR UNLEADED IN THIS CAR....I'M NOT SO SURE ABOUT THAT....WHAT DO YOU THINK....REGULAR OR PREMIUM....WE JUST BOUGHT THE2006 ION. MY WIFEY WENT TO THE WORKSHOP AND THEY TOLD HER TO MIX IT UP...REGULAR THEN MID-GRADE, THEN REGULAR... :willy: