I wouldnt mind betting the DPF filter has something to do with bad fuel consumption. When i had the car from new fuel consumption was pretty good and over the last 18 months has gradualy got worse. The reason for the early service was a blocked DPF filter which made the car undrivable, and now on top of the service not only does she run better but fuel consumption has increased far more than one might expect from just a service.
Has any one else got any thoughts on the DPF filter and is it really necessary!!!!