Look at the right tail light and the right mirror, and take note of how much they overlap horizontally. Compare that to the left side.. TIL this type of spacial awareness that I thought was obvious and stands out like a sore thumb (to me) is less obvious to other people. And just a rough guesstimate base on me assuming it's a Nissan Sentra, I'd say he's 50-75 feet behind, which equates to a 3 second following distance at 35-45. Which is why I never said he was tailgating.