It's highly uneducated (or dare I say cheapskate) move on the part of the keeper of that vehicle. EU6 rated diesels are supposed to do self maintenance on DPF i

It's highly uneducated (or dare I say cheapskate) move on the part of the keeper of that vehicle. EU6 rated diesels are supposed to do self maintenance on DPF ie they start burning rich mixture to bring the temperature up (and this is observed in cold weather) From what I personally observed on my EU6 Diesel (a very common VAG 2 litre diesel... sadly ?) that, the net effect of that comes out as approx 50-100 mile reduction in the range. The reason being more fuel being used to up keep the DPF. In summer (June till October) I observed about 600 mile range from a full tank. Between November and up until February I observed 500 mile from a full tank (between 62 to 64 litres) I was alarmed by the difference and then tried the "Economy" mode. I guess it detunes the peak output to 150ps (from 190ps) and also disengages the engine from the gearbox i.e. the car seems to be coasting in neutral when the accelerator pedal is not pressed. With that, I was able to get 550 miles from a tank so far and recently the weather has warmed up again and the on board computer shows a potential range of about 600 miles. I do make sure to never drive with a heavy foot and even on motor way try to stick below 70mph limit as long as it is safe. However, most of the miles done in that car are strictly urban (max speed not exceeding 50mph) The cost of ownership of electric car didn't quite work out for us as a family when we downsized from two cars to just the one (keeping in mind the cost of public transport in UK) I still somehow think that Diesel is the lesser evil compared to Petrol. It has (hopefully) lower CO2 emission. The problem is NOx which is (hopefully) neutralised by SCR and Particulate which is neutralised by DPF. And you need to burn less of it over the same distance. But sadly it is hard to conclude what's what when the governments and industry keep showing different facets of their relationship every half a decade or so.