HomeAll RepliesReply To: Ecoboost on Terrain Denali Reply To: Ecoboost on Terrain Denali Sponsored June 26, 2013 at 9:42 pm #43709 Vic1212Participant Eco button on the Terrain is just to adjust the throttle response and transmission to make the car more fuel efficient to drive. That button can be a hit or miss for some people. But that’s what it does @bamp Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored