I did my first full last year with the only goal being to finish. With a relatively unhurried swim, extended chatting at the bike aid stations, and probably more walking than needed on the run I finished in 13:30. This year I want to do the same IM (same route) but push it to see just what time I could finish in, with the intent that I don't plan to do another full and instead move to half-distances, and actually work to improve my times (currently age 43).

I'm wondering if aero wheels would be worth it for someone in my condition? I've seen data that they can save 5 minutes on an IM, but I'm guessing that is for perfect aero position, high power output, etc. My LBS can get me a set installed for $800 but it will it do anything legitimate for me other than make my stock P2 look more cool? If it's expected to improve my time by 15min or more, I'm all for it, but if at my level it just won't make a difference, then I'll pass. And, if you recommend them, what depths do you recommend for the front and back (I live in TX and generally compete in low-wind triathlons).