And just imagine if the top wasn't down causing crazy amounts of drag.
They recently tested the two in the same comparison for MT, the 718S trapped 7 mph more. That is not even worth comparing they are so far from being in the same performance category. The 718 also beat it by 3 seconds per lap in the same comparison.
http://www.motortrend.com/cars/fiat/...r-s-toyota-86/