Two Sedans with more similarities, such as the body structure, market segment, ground shadow size, height, and maximum occupancy, than differences, like the starting price, fuel economy, and market segment. First of all, the 2017 Tesla Model S is priced $47,900 lower compared to the base MSRP of the 2017 Audi S8. Also, the 2017 S8 gets 82.1 more miles on a gallon than the 2017 Model S. Among similarities are the body structure, market segment, ground shadow size, height, and maximum occupancy.