Chris Just a thought, could your gauge / tank level censor be a bit dodgy? From your comment about it giving you back a quarter of a tank, you may actually be topping it up, when you have plenty left. I dont know what the capacity is in the tank (should be quite easy to find out) As an idea, next time the dreaded warning light comes on, fill her up and make a note of the litres you used. if you use the right amount, your gauge is probably correct (and therefore your Miles Per Tank 'MPT') if you put in less, when the petrol pump does that auto stop filling thingy that they do, then the chances are your gauge / tank level censor is at fault, and your MPT should improve, by quarter of a tanks worth of milage :D I also have a 3.0, but my MPG is not going to improve, 23.9 MPG as i literally do the same journey more or less, week in, week out under the same traffic / speed / stop - start conditions. Bless her, she never gets to go on a proper long journey :( Anyhow like i said just a thought, those with more knowledge / experience than i will correct me if i'm wrong Steve