My Ateca 1.5TSi manual is nowhere near your figures. Shortish trips it struggles to get 35mpg, on a medium run around 38, doing a steady 50mph on a flat dual carriageway it can peak at 45 but never holds that. Even my previous 1.2 petrol “brick on wheels” (Yeti) did a bit better!.
My range says 370 to 380 miles when fully filled up, around the first 60-90 miles using the trip reading and range reading it adds up to about 415 but drops quickly after the first 1/4 tank and I get about 350-360 in the real world.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!