Eco mode is nothing special, it just keeps the throttle response down. I got over 21mpg in Normal driving mode. The Bronco is NOT a Mustang! you guys are beating your trucks to death. I drove aggressively and still got over 18mpg on my last tank
this week, I got 23.1 using Shell 87. I drive the speed limit exactly and don't stomp on the gas pedal. Yes, there are hills here in SC. I also fuelled up before getting on the Blue Ridge Parkway