I just got an 08 Prius (50k mi), and on the 2nd day of ownership, I got the check engine light. I am hoping that the codes are just from making the mistake of filling it up with Premium Gas, but the error codes say: P0441 Evaporative Emission System Incorrect Purge Flow P0455 Evaporative Emission System Leak Detected (gross leak/no flow) The car has no smell of gas fumes, gets about 50 mpg, and looks very clean under the hood (like new), runs very smooth. I just changed the gas cap, and am hoping that after the gas goes down, I'll add the 87 octane gas, and maybe I won't see the check engine light. Any ideas what those codes usually reflect? THANKS!