2015 premium w/20k miles......so, my ECO System has not activated in months. While most of you may think of this as a bonus, I feel something is wrong and stopping it from activating. Another issue that has happened, A warning message came across the dash that said "Tire Pressure Monitor System Fault". I dropped it at the dealer and asked them to also do the tranny computer update. Well, according to them, there is nothing wrong. No stored code for TPMS Fault, Tranny does not need an update, and they said the ECO system will start working in a few days. They said the aftermarket tires most likely caused the TPMS Fault. It wasn't one wheel, but rather a total system fault. I suspect the vehicle has a bad battery but dealer says no. The loaner they gave me was filthy, enough dust on the dash to write my name in, dried dirt on the seats, candy wrappers between the steering wheel and dash, and food crumbs all over the console. And this was a 2016 discovery with 1800 miles...... I really thought this was supposed to be a luxury automobile and dealer. I am beyond disappointed with this entire scenario.