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Originally Posted by 1zippo1
JC claimed when he did the 1200km on one fuel tank with an Audi A8 4.0TDI that it was more economical in a modern car to let the revs drop and keep the car in gear, then to put it into stationary. I never thought this would be and I still often dump the clutch when I'm rolling down a hill for instance.
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The fuel strategy for an automatic isn't the same as it is in a manual transmission vehicle...it's very difficult to predict what a driver is going to do in a car equipped with a stick, therefore the programming is much more primitive. In a car equipped with an automatic transmission under deceleration you should definetely stay in gear, as the ECU "starves" the engine of fuel. When you're sitting at a traffic light, I doubt that it makes much of a whether you're in Neutral or in Drive, the revs should stay roughly at the same spot once the idle-speed controller kicks in and the torque converter sits there straining against the brakes.