I’ve been looking at comparative engine technology, Brydo as the X1 with similar weight and power does so much better. It might be engine mapping or it might be to do with the Automatic Variable Valve Lift or the Dual Spool Turbocharger which the seemingly much more advanced B48 engine has.
I checked the fuel consumption today and it’s showing 40.1 mpg since the last fill-up and that’s all short journeys of no more than 3 miles.