So I read a thread on here about someone using the ECO mode and got great gas mileage. And it may have been true. Here is what my trip was, Went to Ennis, Texas from Lawton, Oklahoma to watch the NHRA race (AWESOME) and I figured id give it a try. I have a 2016 SRT, no I'm not worried about gas mileage if I was I would drive a Honda or something anyways I drove down there and averaged 20.2 mpg and thought well hell I've ran this similar distance and left it in default mode and got the same results. So I wonder if this ECO mode would work better on a really long road trip rather then a short one???? Anyone else try this mode?