Re: ECO On/Off
I rarely push that button. Eco mode is just fine with me. If I need a little boost I drop the shifter into sport, and I don't do that often. Even merging onto interstates, I get plenty of power. As far as the sounds you're hearing from the engine bay, I'm not noticing any myself, but since shifts hold off a little longer in Eco mode, maybe you're hearing the engine lug a little. I've read on other threads that it can take several thousand miles for the tranny adaptive learning curve to get used to your driving style.
Mine: 2014 Overland 4x4 V6, ORA II, billet silver/black, Michelin LTX M/S 2's, MaxCare Lifetime, delivered 4-13-'13
Wife's Jeep: 2008 Compass Sport 4x4, 2.4L I4 DOHC, CVT, Lifetime powertrain warranty