Steve, How, where and how much?? Your symptoms sound exactly like mine right down to the sooty exhaust.
I'm not bothered about the banging exhaust but I would like better m.p.g. I'm sure that the GDI engine burns more fuel than my two previous Duratec's, I am very light footed and am only getting around 26mpg as opposed to close on 40mpg for the previous two.
