Originally Posted by djgandy
You cannot get the advertised numbers unless you drive everywhere at ~50mph on a flat road with no wind and never brake.
Considering your journey distance, if you averaged 60mph then you are only driving for 20 minutes. The engine will not be running at full efficiency until the second half of your journey.
~45 seems not too bad. The 320d is probably more fuel efficient than the 320d on A/B road journeys.
Errrrmmmmm well my 325d is only meant to do 47mpg combined, but yesterday at 2 degrees Celsius I drove a 380 mile return trip to Birmingham at 75mph and it returned 54.3mpg, plus I was squeezing the throttle hard on slip roads etc.