Ford claimed the 2.2-litre turbo-diesel would do 8.1 L/100 km on average, their claim for the 2.4-litre engine was 9.4 L/100 km. Be cautious when buying a used commercial vehicle, particularly one that is as old as the one you are looking at. They generally do lots of kilometres, and an eight-year-old one could have done 500,000 km or more. The Transit is known to have problems with turbos, and the timing belt tensioner is a known weakness. If the tensioner fails, it could lead to the chain breaking, and major internal carnage can then happen. If you're serious about the van have it checked by a mechanic who knows them.