What fuel do you run in your EcoBoost pickup? (not HO)

Defer to Shiner, he has much more current knowledge

Mine comes from trying to figure out they why my MPG went down during seasonal changes to fuel blend

Those ECU's had memory's that could be wiped clean with the removal of power for x hours or so. Not so with today's onboard memory

ever since the advent of knock sensors, their ECU's backed off timing "NOW"...that is the whole purpose and usage of a knock sensor