how long should struts last?

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Hi Chris,
Here are some more things to look for in determining strut life:
http://articles.cnn.com/2009-04-03/living/aa.shocks.strut.replacement_1_shock-absorbers-aol-autos-struts?_s=PM:LIVING

As I had a chance to sit shotgun with you at Buttonwillow last year I have some observations:
Your car felt pretty tight and planted in most corners, better than mine, but it sits pretty low in front and exhibits noticeable bump-steer due to the change in steering geometry. Eliminating bump steer would lead to smoother tight corners, better corner exit, and faster laps. At 82K your struts are probably not "optimal" and you would benefit by a fresh set along with a few hours with one of your NorCal suspension Gurus to really dial it all in. Just my 2 cents.