[gnhuk]

Diesels usually take something around 10k miles to loosen up - a fact which the manufacturers don't tell you, so I wouldn't expect a new engine to give wonderful numbers. The advertised mpg figures are done on a rolling road IIRC to some formulae which bear very little relation to what happens in the real world.... A 1.6d is a bit small to lug around an S40. What size is the tank? The classic petrol models have a 60l (13 gallon) tank so 10 gallons sounds very small.