My Prius just turned 100,000 miles. With little over four years of ownership, the only thing I had to do periodically was change the oil and replace a few air filters. All mechanical systems have held up - I still have the original brake pads, muffler, and everything else. My Prius has been extremely cheap to keep and I highly recommend it as a primary family car. As far as tires go, I'm still on the second set!!
Keyless entry, the toggle shifter, and the far forward in-dash display
The light tan interior is hard to keep clean - this was all that was available in 2004, hopefully, Toyota has changed this for newer models.