I purchased my 2015 SE C-Max in late November 2015. I currently have close to 6000 km on it. I am averaging 5.8 L/100km and it is in winter driving conditions here in Canada. At what mileage (km) have you noticed an increased fuel efficiency due to break-in? I understand that temperature plays a big part but does it take up to 5,000 - 10,000 km to see enhanced economy?