How reliable (or not) is the Dr. Prius Life Expectancy Test? Ran it twice yesterday on our 2008 Prius (247,500 miles) that our daughter is going to purchase from us. Both test results showed the battery pack at 67%. A co-worker replaced his 2004 Prius battery pack not too long ago, however, and he was at a little over 250,000 miles. I know there's a lot of variability among vehicles and battery packs, but any additional information would be greatly appreciated.