Happy Charlie

Bought a new IS300h 4 months ago. Love the car and the Hybrid principle but Lexus should be referred to the ASA for the fiction of advertising combined urban MPG at 64.2 ,utter nonsense. At best I am achieving 45 mpg and I am not a fast driver ,the motorways around Manchester are all 50 mph for the next 2 years of upgrading .I am always looking at my monitor to achieve EV mode .Where do they get these figures from ? My friend also bought a new is300 around the same time time as me and has the same story to tell. Would love to hear from other hybrid users.