79k miles.
P.S. Way too much info required via the referenced website. Not easy to use, not willing to put up with it.
I'm working on this. Can you be more specific on what seems excessive?
Some people find the site simple, others find it overly complicated. I'm working on a redesign that will serve both groups. Detailed feedback really helps.
On the survey itself, we're very close to the minimum sample size for a few years of the Miata now. A few more participants per model year would be very helpful.
The site has some shortcomings, but we'll be happy to work with anyone who's willing to help us to fix these and provide everyone with better information.
Details here:
Car reliability research