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I don't do it myself (too much traffic where I live - and I don't want my inconsistent speeds messing with other drivers). But I understand you do not want to be in DFCO for the glide. In a manual you want to be in neutral. You glide further this way and actually, paradoxically, you burn less fuel over the trip even if it's just to idle the engine during the glide - because you glide longer.
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