I like Angmaar's answer. Your driving technique will have a big impact on your fuel economy. Anticipating well in advance when you will need to change speed will allow you to roll through situations where other, less obeservant drivers would come to a stop and then need to accelerate back up to speed.
I'm not sure of the merits of taking it out of gear. Some modern cars will go into a fuel saving mode where they consume very little/no fuel on the over-run so it might not be worth the effort to shift.
Other suggestions would be increase tyre pressure, remove unnecessary weight and remove any external protrusions like roof racks, spot lights or aerials. Ecomodder has vastly more on these topics.
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