My Gen 1 2002 Prius has 211k miles. I just got it and wanted to check out everything that would be possible to check myself without a mechanic. Everything seams to be working fine besides a noise coming from the rear that i believe is a worn bearing. All i know is that the battery was swapped for used one about a year ago. What should i check? EDIT: I have an average of 47.3mpg on the last ~600miles.