While I've never had a problem discerning the ECO button from the fuel door button, I did have a problem when we first got the TCH in that I would reach down and work the hood release thinking that it was the parking brake release (first time with push-on/push-off)!

I'm more concerned here with the ECO button not having memory. I get tired of having to press it to turn on (I never press it to turn off). That and the recirculate button with the same problem.