Any fuel injected vehicle tend to run richer in the winter. Install of bottle of this to make sure your injectors are clean. My gas mileage jumped after a bottle of this and a full tank run through.
LIQUI MOLY - Motor Oils, Additives, Car Care - Products - Fuel Injection Cleaner

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2002 X5 4.4i Sport Wheels
2014 X5 35i M Appearance & suspension package
1995 Porsche 993
1972 Porsche 914-6
2020 GLE 450 Twin Turbo
2019 Alfa Stelvio 500hp Quadrifogilo
Many motorcycles