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Originally Posted by zpiloto
I played around with this not as an experiment bases but just to see if I need to go further with it. My car is an automatic. I was plusing 5 miles over the posted speed and gliding to 10 under. I did this over a 40 mile test loop with rolling terrain, mixed driving and multiple stops. Traffic is never a factor. Just one run plusing and the other normal driving style. Avg speeds for the loop were 36(plusing) and 40. The Plusing FE was 38.2 and the normal style driving(if you can call it that) was 38.6.
Take the results with a grain of salt. I'm sure there are better way to pulse than what I was doing and with time it would probably make a difference once you perfected the technique but for me with the auto it just not worth the effort.
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It seems that it has no positive benefit. And may actually hurt economy, since, for some cars anyhow, constantly accelerating/decelerating may prevent EGR from functioning as well as it could. Assuming of course that the idling below the fuel cut corresponds to light throttle.
MetroMPG 
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