My husband and I are taking delivery of a new BMW 520d SE auto in January. We've never run a diesel before and are absolutely thrilled at the prospect of much more economical motoring. We've run Renaults, Peugeots (including a gorgeous 605) and SAABs for years and have a 9-5 HOT Aero auto at the moment. It's perfectly delicious to drive as it's used almost exclusively on long motorway runs every week (21,000 miles per year) and we put Shell V power petrol in. We'll miss the sweet running and wonderful power it holds in reserve, but not the expense of servicing and taxing it. Please could you advise the most economical way of driving our new BMW. Also, we always drive our cars very gently whilst cold, gradually letting them build up themselves until we cruise at the legal speed. Is it OK to carry on driving this way or not? I also try to avoid braking if at all possible.