I've seen a few descriptions of people mis-applying the pulse and glide technique on various web sites & forums.
More than once I've read of people describing the technique as simply repeatedly accelerating and letting off the accelerator (to achieve fuel cut). The logic being, "if I'm in fuel cut, it must be more efficient!"
Of course the penalty of being in fuel cut is that you've got engine braking, and the vehicle won't travel nearly as far as it will in a neutral, engine-off glide.
One person did a "pulse and DFCO" experiment and posted the results of his efforts on his web site. He noted 2-4% worse fuel economy based on the before/after "A" portions of his on-road A-B-A comparison over 575 miles for the "B" portion (using p & dfco in the "B").
Full details (see Part 5 of the page):
http://sites.google.com/site/diyover...er-experiments