Well, as some of you know, I live in the damn desert. During the summer it is 96+ degrees on average. On top of that, I'm 2700ft above sea level. Plus, it's just time for an all around tune up. Fuel filter, cooling system flush, brakes, ECT. With that being said, I read somewhere that people who live in hot and humid climates should go a step colder on thier spark plugs. any truth or twist to that? I suggested the Iridiums just because i'm curious and I wouldn't have to change them out so often, so they say. Any suggestions are welcome. BTW- If you read this thread, just vote even though your not going to post.