when you factor in the extra cost of gas for the 93 octane then whatIf you "act a fool" in an EB and run 93 Octane, then it definitely is a wash.
Coming from an I4 2.0 Turbo Camaro, this was definitely my case. If I drove normally in the Camaro, I can get 5 days (95 mile commute) worth out of my tank. In the Mustang with the V8, it's 4. If I ran the Camaro like crazy, it was also 4 days.