Only guy I know who did that (British, supposedly SAS) was lying, and easily found out.
I did once chat to a guy in a 10 mile race, who was in the US Air Force, stationed at Menwith Hill. Probably 30 years younger than me. Made a big deal of how he'd done the US Marines marathon, and what a hardcore runner he was. When I got bored with it I accelerated uphill and left him for dead. Childish, but satisfying.
I suppose you being in your car helped.