I think the answer to this question lies in the weightHow can the smaller E pace have worse MPG than the F pace?
All car makers care to be is good enough and for many years Jaguar has been depending on brand image along with just keeping up with rivals on paper.I seem to get around 19 MPG on average.
If I do highway driving with cruise control, and at the speed limit, It seems to get around 27/28 as advertised.