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If the ECU is over-fuelling the engine you'll get a lot of black smoke out of the exhaust every time you put your foot down. You really need to find a diesel specialist who will be able to diagnose and cure this Don't rely on the consumption figures displayed on the dash, especially if the fuel gauge isn't working properly - they're woefully optimistic at best. If you want an accurate picture of your fuel consumption, do it long hand - knowing how to use Excel can help here! Next time you fill up, reset the trip meter to zero; at the following fill up, fill the tank to capacity. Note what mileage is displayed, and make a note of the number of litres purchased (or the total cost and cost per litre). Reset the trip to zero again. To work out your actual fuel consumption in mpg, proceed as follows - 1. Work out how many gallons you've bought - divide the total price you paid by the price per litre, to obtain the number of litres purchased. Divide the result by 4.546 - this will give the number of gallons that you have bought. (Example - £50 total divided by £1.249 = 40.03 litres; 40.03 divided by 4.546 = 8.81 gallons). 2. Divide the number of miles covered since the last fill up, by the number of gallons you've just purchased - this will give you your actual mpg. (Example - 300 miles divided by 8.81 gallons = 34.1mpg) You'll find that this figure will vary quite a lot from what's displayed on your dash. Also, pay attention to your tyre pressures. An under-inflated tyre can really drag your consumption figures down

I know what you mean Gareth, it does seem that there's very little meaningful interaction on this forum - it's much the same on the A5 Owner's Club forum. There seem to be a lot of people viewing posts but very few actually contributing to the forum. I think that the issue is that there are fewer petrol/diesel heads about, and many more people who have a passing interest in cars - I suspect that the latter are in the greater majority here. I also think the fact that an Audi is now much more a lifestyle statement than ever before ("Look at me, I've got an Audi!! I don't know or much care what makes it tick, but I've got one!!!) and you've got a recipe for little if any interaction. Shame - the VW scene is much more vibrant. Luckily I have both so I can get my fix one way or the other!!