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My daily commute (72 miles e/w) is spread over the M20, M26, M25 & M3, with about 10 miles of A roads. Going to work i average a true 53-54mpg (DIS 60-64). At the weekend it drops to mid 40's. A4 B6 130

VAG states bio-diesel compatibility only from 1996, but not for the latest 2L tdi's. As for SVO maybe a blend although the jury is out on the long-term issues regarding that. I'm looking to twin-tank the A4 (B6 130) very soon, with the amount of mileage i cover i'll break even in 6 months.

If you get hold of the service book, it will tell you what needs doing and when.