Currently have around 40k on my Gen 3 engine. I've bounced between E85 and 93 since 10k miles and was curious on plug life. Since the Gen 3 is DI it can be alot harder on plugs. Most Ecoboost owners tend to change at 60k albeit a turbo engine vs N/a.
Good parts list, Im going Fore dual system and i have longtubes catless, 3'' collector back. How does she run? Dyno? 6.3 is moving pretty well for being on the stock pulley essentially.