Stupid because I never thought to use Google Earth to measure my favorite stretch of the Don Tyson Parkway, vidicated because I came within three quarters of a percent of the correct distance using only a bicycle, a tape measure, and a short piece of duct tape.
My original measurement was 1.355 miles which I elected to round down to 1 1/3 miles mainly for simplicity of calculation but also because I didn't want to overstate my running distances. I got 3550 feet each direction, about 1.345 miles per lap, using Google Earth's path measuring tool. I'm going with that for my official distances but can still use the handy 1 1/3 mile distance for managing my runs.
It astonished me sometimes to see how completely stupid I am. If it wasn't for my moments of startling brilliance, I'd probably get really down about it. As it is, I think I bungle my way through life fairly well, all things considered.