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Don't have any evidence, but I'm thinking it comes out nearly even. You maintain more speed in neutral and therefore get a slightly longer overall coast.
I mostly N coast. There's a 2.2 section of road on the way to my parents house that if I can hit 75 MPH and then shift to N, I'll make it all the way to their house. DFCO makes me lose too much speed to maintain a coast up minor hills along the way.
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