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Ok, I spoke with Audi's engineer and what he said was crazy but it worked. He said that the 'efficiency' setting does not work with my driving pattern and that I should switch it to 'Auto'. I did this and i'm now getting those high mpg again. It works so I am happy but it's a bit misleading. People who don't know this and are thinking they are doing the best thing by using 'efficiency' mode are losing 10mpg, on a 60ltr tank is 150miles less.

As I tell anyone who buys an old Audi. Regardless of how cheap the car becomes the bills always remain expensive.

I always went off the rule what ever figures the dealer claimed, take 10mpg off them for a roughly realistic figure

Hi Leo, my advice would be to get a garage to replace the EGR. You can attempt to clean it but this often doesn't resolve the issue. Cheers Steve