Petrol would get my vote. In terms of mpg I’m not sure there’s really a huge difference between the two. The diesel is an Audi unit as fitted to A6 cars of the era. My understanding is that these engines are complex and expensive to service and repair. A neighbour of mine had an A6 of that vintage, and a cambelt change came in at £1000 - and that was ten years ago.
Jack
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