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1. I don't think so, but someone else might know otherwise
2. Only when in gear, as it requires that the momentum of the car is forcing the engine to turn. Switching off the injectors while in neutral would cause the engine to stall. Most cars with fuel injection will shut off the injectors while the the gas pedal is not being pressed and the RPMs are above a certain threshold (so the car doesn't stall). You can find your car's threshold by engine braking at low speed in 1st, there is a very obvious change (car stops slowing down/accelerates) when the revs get too low.
3. P&G gliding is usually done either in neutral (or with the clutch disengaged) with the engine on, or in neutral with the engine off. I think (but could be mistaken) that leaving the car in gear would mean that you decelerate too quickly for there to be a benefit over driving at a steady speed.
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