So I've had my 2015 Ford Fusion Titanium 2.0 Ecoboost for about a year. I bought it CPO with roughy 35k miles on it. It's up to about 44k now and I've recently noticed that I'm losing coolant. It takes me about a week to go from the max line to minimum line. It has never overheated and I'll be perfectly candid that I don't know what coolant smells like to know if it's leaking from anywhere. I took it to the dealership and they ran "every diagnostic tool" they could. It came back negative for any pressure leaks in the coolant system, no coolant was found in the oil and there was no sign in the exhaust that it was being burnt off. The Ford rep literally told me to just drive it until it gets worse, which sounds like the worst idea in the world. I know this was a problem with the 2013-2014 models, but I haven't found anywhere that this problem is in the 2015's as well. Any input on the subject and other places to look would be greatly appreciated!