I always wave too, and am amazed at how many never acknowledge it. I even feel compelled to wave at cars for some reason. Any way for you to go back and figure your exact mileage using mapmyrun.com? That’s what I try to do when my Garmin dies.
I know the distance was 10 miles because I ran from the trailhead to the 5-mile marker and back. After I stopped running, I counted the seconds until I could get back to my car and glance at the time on my phone (10:34 - 3 mins = 10:31). The Nike+ data tells me I started at 9:14, so I figure it was ballpark 1:17 total.