Hi Guys! Since the manual says that the life of the plugs is 105k miles, I have planned to replace them around 100k. However, recently I read elsewhere that the plugs can deteriorate so much that replacing them around 80k can have significant impact on mpg (Not for MDX). So I begin to think whether I should do it ahead of the schedule as well. I am wondering whether anybody here has relevant experience to share? Thanks for the help.