So IL guy wrote:
Tunnel Hill is a rails to trails path. Flat or steady 1 percent grade. Faster than a flat road course because of the softer, crushed limestone groomed surface. Protected by trees, so negligible wind. Perfect conditions today. Not a true trails race. All world records in the future will be set at Tunnel Hill.
since when is a "softer, crushed limestone groomed surface" faster than pavement? it's not faster at 25 mph, it's not faster at 15 mph, and it's not faster at 8 mph.