Following your advice in the Telegraph to use Shell V Power or BP Ultimate Diesel
I can, with certainty and experience, say it is the best thing I have ever done since taking ownership of an imported 2.5 Turbo Mitsubishi Pajero LWB ten years ago.

With almost 200,000 on the clock now I can still get 28/30 mpg and not less than 26 mpg with a four wheeled trailer and a ton of wood on the hitch (makes an excellent tow vehicle). So thanks for that, taking up your advice has given the Mitsubishi a new lease of life and improved performance all round. What a difference!