Might want to use an electric car to avoid the fumes. I do wonder if the car, even a larger distance ahead, does more for drafting than a human in front of the runner.
I don't have the source on hand, but there was an interview with the person who designed the unusual reverse-V shaped pacer formation, where he said that if it was up to him there wouldn't be a car in front of the runners. The goal is to have as much air as possible hit the front pacers.
