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this depends on the car
My civic has a high rpm, and peak power at 5500 rpm. Maybe for that reason, the mileage is much better with pulse and glide, than it is with driving at a steady light throttle.
I've tried the latter several times, averaged about 10 mpg worse, and immediately went back to pulsing and gliding.
For my car, I think the difference between going an even speed and pulsing is not that much, compared to the great benefits from gliding. Also, pulse & glide is more effective the longer the glide, thus with better aerodynamics of the car.
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