For someone to figure this out they would have to know et of both vehichles and mph of both vehicles at different points of the run. Say your car had alot more bottom end than his and he was catching you on the big end, he would be making up more ground then you making the gap he could travel in .025 bigger than if yall ran the same mph at each check point making the gap he traveled in .025 smaller. Don't know if I made any sense to you. If this was a bracket race then you would have to throw in your dial-in.