The best MPG is achieved in the highest gear that the engine can comfortably pull, and certainly keeping the engine off boost will improve MPG (probably around 2,000rpm on the XUD).
Plan ahead as much as possible and try to avoid using your brakes. Braking = turning the energy the engine has created into useless heat. Come off the throttle early, move down the gears and arrive at your junction/roundabout/whatever at the correct speed and gear having not used the brakes.
Keep a good distance from the car in front so when they brake, you don't have to, just come off the throttle.
Plan ahead as much as possible and try to avoid using your brakes. Braking = turning the energy the engine has created into useless heat. Come off the throttle early, move down the gears and arrive at your junction/roundabout/whatever at the correct speed and gear having not used the brakes.
Keep a good distance from the car in front so when they brake, you don't have to, just come off the throttle.