Fuel Consumption #2

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Thanks to everyone that posted a reply...here's another question

I guess there are several uncontrollable factors in this question, such as weather consitions, turning a corner, etc.

What if you are in an Automatic car, stopped at a traffic light, the ground is flat, and you have to wait about 2 min.

1.Shift to N
2.Stay in D

As I have noticed that whenever I shift into N, I can feel as if the brakes gets more power? The brake pedal sinks deeper by itself.

Also, someone mentioned the computer in the car that measure the amount of fuel used, whenever stopeed, it will always say 99/100km.

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Is #2 saving fuel or using more fuel?

Say you are doing 110km on a highway in a 3.0 V6 Camry and there is a long downhill coming up about 2km. Engine revs at 3000rpm.

1. Let go of the accelerator, engine at 2000rpm for the duration of the downhill.

2. Let go of the accelerator, shift to N, engine drops to 800rpm for the duration of the downhill, shift back to D before the uphill, engine revs very fast back to 3000rpm.