Two or three months ago some members on here were advocating the use of 'Cetane' fuel additive for diesels, I usually buy supermarket fuel, so I bought some on eBay, cost about £22 for 5 litres, but you only use 1/1-5ml, per litre of fuel and it should improve mileage , performance, and keep injectors clean, at that ratio of use, 5litres could dose 5000 ltrs of fuel so its a lot cheaper than the expensive diesel. I've been using it now for 2/3 months and MPG, is perhaps slightly improved, but the general feel of the car is a much more lively performance, and if it also keeps the injectors clean, will continue to do so. Several others on here said they would give it a go, so wondering what they think of it.