New Z owner and had the same question. I always coasted downhill with my automatic Civic and after 16 years no transmission problems (that I know of).
But my Z really slows down when off the gas, even downhill. The Z also has stickier tires. I'll try paddle shifting to a different (higher?) gear.
The 2015 owners manual P 5-13 says "Caution: Coasting with the transmission in the neutral position may cause serious damage to the transmission".
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