Hello, I bought a Audi a4 b8 2008 2.0 tdi sline about a month and a half ago. everything was going great getting 350 miles for Â£50 odd Now all of a sudden I am getting 250 miles for Â£50 odd I think the fly wheel is on its way out but I wouldn't think it would effect mpg so bad. I did smell a regen try the other day but I was pottering around town. Since then I have drove on the motorway anyway? any ideas?