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Echoing others, you'll need a UG or SC to know for sure but I can't tell you how it is with my Honda.
According to my Ultragauge, coasting in neutral above 45 mph actually has a higher engine load and therefore higher fuel consumption than coasting in gear (or engine braking if you prefer). Reading other posts, I understand it as your velocity being used to turn the engine so you lose speed more quickly but less fuel is required to keep the engine on.
Neutral coasts a longer distance so I think it's a wash either way for my Civic fuel economy wise. I choose to keep it in gear when I glide for the transmission's sake.
P&G beats constant 60 mph in my vehicle. But don't forget about Drive With Load. I DWL most of the time and P&G on a few rare occasions when traffic lets up.
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