• The fleeing car wins if it either a) crosses the finish line first or b) increases the gap by +1 card for every 5 cards on the total track. For example, if Sheriff starts 5 cards behind, then Lightning McQueen wins if he can increase the distance to 10 cards.
After playing this variant some more, it is too easy for the fleeing car to increase the gap by +1 card for every 5 cards. I'm now thinking it is either +2 for every 5 cards. Or, to keep the game simple, just scrap this particular rule altogether — so that the fleeing car only wins by crossing the finish line first.