I have a 2007 Toyota Prius with almost 67,000 miles. I've been on the fence on whether I should wait until 80K to change my tranaxle fluid or do it now. I bought the car used in 2009 from a Toyota dealership and it was a certified used (it had 44,000 miles). That's suppose to mean that made sure that all the fluids were clear and uncontaminated, but you never know with the dealers. Background: I live in Austin, Texas but drove the car from Austin to Fort Worth on a regular basis during last year (mainly highway driving). I haven't had any issues with the car so far and I don't want to have any, so i am curious if I should shell out the $400 and do it now or wait. Thanks so much!