kuripot;
Take a long phillips head screwdriver, place the handle on your ear and the point on the fuel injector body (any injector, doesnt matter). You should be able to hear the injector ticking as it works (engine running of course).
Rev the engine up and release all throttle, you should hear the speed of the ticking go up, and if you let off the throttle completely the injector ticking should stop completely and start again when the engine is at idle RPM.
Staying in gear with no pressure on the accelerator pedal does the same thing. Instead of using fuel idling, you are eliminating all fuel delivery to the engine. It can save you a lot of fuel in stop and go driving.
I like to stay in top gear until my revs get down to about 1000 RPM, then downshift to keep the revs above 1000. If you do it right you will be in the right gear when it becomes necessary to reaccelerate.
regards
gary
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