I never get less than that now around town. Motorways close to 50mpg average.
I have had my gp nearly 5 years now and have cleaned and changed the egr numerous times and it is amazing the difference it will make when a new one goes on - it has always improved the fuel consumption by close to 10 mpg.
The problem is you do not notice it is dropping away but i am very aware of the symtoms now.
If you search i have posted lots of stats on this over the years.