The spark plugs are definetly one of the draw backs of the Insight. Special, special, special. Make sure you get the right stamped plugs prior to walking out of the dealer. The Honda parts guy said they were all "B" stamp and so I checked. One of the three was an "A" stamp. Very important to get the right ones. I'm assuming the plugs come with the gap pre-set, Right? What if they are damaged in shipping and the gap is moved? Where do I find the correct gap for a "B" stamped plug? How would I ever know if the gap is correct or damaged somehow?
All I can say is that I'm glad the plugs only need to be changed every 100K miles. BTW I just joined the 100K club this week!