Seems like the ‘true’ achievable MPG figures are guesses these days.
From the Kuga 2.5 PHEV:-
Combined Fuel Consumption – PHEV in Operating Mode (WLTP) 201.8 mpg (1.4 L/100 km)*
Combined Fuel Consumption (WLTP) 43.5 mpg (6.5 L/100 km)*
So you ‘might’ get somewhere between 43.5 and 201.8 mpg.