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It's true. Rolling hills provide a means for pulse and glide without annoying people behind you. As long as your engine load doesn't go too high on the uphill so that it switches to open loop (rich default fuel mapping).
Neutral coasting (or EOC if you are brave) helps more than DFCO on the down hills, unless of course the hill is too steep to do this safely because DFCO robs energy as the car has to turn the "dead" engine as you coast - more energy than the energy required if the engine was idling in neutral.
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