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I'm keenly reading all the input here, I have a science background so understand all the momentum, gravity, potential energy stuff.
Just trying to get my head around the whole pulse & glide thing, there is a few runs I do through undulating country, where I do the no brakes thing, all about timing the crest, to just roll over the top, allow gravity to pull you down, throw in a bit of juice at it on the next rise, then go again, this works well.
But I'm not convinced that doing the same on the flat will have the same benefit, particularly as vehicles have so many different systems adjusted by ECU that in some vehicles at least it would be more economical to hold speed constant at low load, eg many vehicles engage EGR at this point and I believe fuel consumption goes down at those times, but I don't know for sure, just bits I've read around the place.
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