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I do not have any idea on numbers. I thought of pulse and glide ten or more years ago--I thought of it as "Leapfrogging," but I stopped when I did not notice any better fuel economy, but I did not have instrumentation.
The first time that I tried it with my Ultragauge I did not see an improvement, but I was one mile higher, whatever difference that makes. After that road trip, my average MPG was coming down, so I pulsed-and-glided again, which seemed to help. I was accelerating from fifty to sixty and then coasting down, but I noticed that my instant MPG increased as I continued accelerating. It seems to peak about seventeen or eighteen at 70 MPH, although I wonder how much quicker I decelerate from higher speeds.
My last tank was 27 MPG in a Subaru Forester rated 18/24. The EPA says "20 combined," so I think that I have improved thirty-five percent, and I do not know what I have changed besides higher pulses.
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