1996 300tdi with 170,000 on the clock. Towing horse trailer with Shire on board at 45 -50 ish on Motorway, Dual Carriage way and decent A roads 32mpg (and we did this under research conditions cos we're sad gits). Same load around Dartmoor nearer 24 mpg, but you can't get any speed up in the lanes. Steady motorway driving i.e. at the 55pmh used in the manufacturers tests 44mpg. I use an enhanced brand of fuel which returns a 15% increase in economy over the standard version and the engine is lovingly maintained with slick 50 and regular air filter changes. Due to the cost of fuel I now drive in mpg rather than mph. I do fill up totally to check fuel performance about every three months and yes I should get out and get a life...