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MadisonMPG - the slower the speeds at which you P&G, the more advantageous that technique is, vs. driving with load (DWL).
I'll echo what others have said: P&G gives better results than DWL. But I don't do P&G much any more in normal highway driving (a repeated P&G routine, that is) because it's kind of a pain in the butt (to me), and it makes sense to me that it's harder on the car.
Skylark: you're right that pulsing briskly will show worse instant MPG than pulsing slowly. But the brisk, low MPG pulse is more efficient when it operates the engine in its best BSFC zone. You'll end up using less fuel to reach a given target pulse speed because you spend less time accelerating.
Of course, this mostly applies to cars with manual transmissions, where the driver has more control over engine load (through gear choice, no torque converter).
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