The td4 engine is a bmw engine also shared with the rover 75. does about 35-40 to a gallon i think.
what spec is the car? there is S, GS or ES. S being the lowest, no alloys for a start, gs has 15s as standard and es has 16s as standard.
Good cars but check the warrenty repair work that may/will have been carried out on it.
Its a good price for the car in the colour and mileage.

the 1.8 petrol can blow head gaskets but if repaired PROPERLY then they are fine, drive like normal car ie dont kick the cunt out of it when stone cold and it will be fine