Is 142000 miles on a 2005 Toyota Prius hybrid considered too much?

Answer 1

If the car is running well, then no. My cars all have well over 200K miles on them with the front runner just about to hit 400K. That may be a good time to retire the Suburban, but your car is just getting broken in. To add to the pollution issue by junking cars before they are dead. You do far more damage to the environment by premature junking of an auto then the Prius could ever save by using less fuel.

You are at the true crossroads of being environmentally friendly. Do you do what is right for the environment and keep using the car or what feels good and get a new one.