What's a good mileage to start thinking about changing the serp belt? I'm at 75,000 miles on my 2006 Canyon. Mostly highway mileage. Belt looks pretty good with no visible cracks, but I live in hot Central Florida. Thinking about heat cycles & it's effect on belt stretching. Ideas? I like to prevent issues, but at the same time why be wasteful if the belt looks pretty good, right? Thanks