I'm at 97k miles on my Accord. Decided it was time for new plugs in my highway cruiser: Changing the plugs was quite easy. Here's what the factory Denso's looked like after 96k: All 4 plugs were still pretty much gapped dead nuts at 0.044, which is factory spec. I bought the factory spec'ed laser iridium NGK's off Amazon for $40, which was a good deal. I'll change them out again at 200k miles next time.