This sort of thing is more commonly known as "Pulse and Glide". It became popular with the Prius, particularly when the well-packaged second generation version came on the US scene in 2004 and Prius owners went apey trying to outdo each other in the quest for the highest fuel mileage.
While it is an effective technique, it takes effort. What's worse is how it affects surrounding traffic. For other drivers operating their vehicles in a normal manner (particularly in crowded urban environments), it's aggravating, if not downright dangerous and almost certainly contributed to the ire Prius drivers used to garner.
I'd just be happy with the perfectly adequate mileage achieved by normal, careful driving.
'18 PacHy Ltd, red/alloy, 18" whls, roof, AST