[tt82]

Purely because of the mileage I do, it's a full tank every time. My local Shell garage is literally only just round the corner from my house so it would cost me nothing to fuel up daily.

Were I not doing the mileage, in Autumn/Winter/Spring I would be tempted to keep the car brimmed as much as possible to reduce the amount of condensation inside the tank. I know modern cars all have plastic tanks unlike older cars with there steel tanks, so rust is not an issue, but the D5's do have a catch in the diesel filter for water. I wouldn't want this to overflow and water to pulled into the engine. In Summer I may be tempted to only put in what was needed, although the economy benefits for doing so would probably be negligible on a car weighing nearly 2 tons!