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I don't know about gaining, but I watch my "current" MPG drop off while I am idling. I suppose that any time you are not moving and not using gas, that would be an MPG gain, vice idling and not moving.
The rest of your question - I lose about 1/2 mpg max idling over 30 seconds - depending on how far I have traveled on that trip. The less time it has been since I started the trip the more MPG loss.
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