Hi just wondering if you found out what the problem was
ECU or the carbon canister? I have exactly the same issue with my Ford Mondeo 2016 MB 2.0 litre giving me an average of 13.2 litres to 14.1 per 100, my XR6 gives better mileage at the moment. Still under extended warranty with Ford at the moment who are saying no alarms no isues, completed 3 tanks of fuel to show mileage barely hitting 350k's.