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I do it constantly in my 2011 Fiesta but it's a salvage rebuilt car with no warranty. If I was in your position and had a warranty I would only do what the manufacturer specifically approved in order to maintain the warranty.
You have to assume the worst, which in my case would be a used transmission, which in your case would be a free new or rebuilt transmission.
Once your warranty has expired then you can choose, as I have, to coast in neutral, engine on. You can see the mileage in my fuel log over the last 24k miles.
regards
Mech
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