I did an AB test with this on 2 separate tanks it was roughly the same temperatures and traffic, and the same route the whole time. Coasting in Neutral resulted 23mpgs while coasting in gear resulted 20mpgs, even if by chance the cars do coast the same in neutral as in gear which i feel neutral coasts further your rpms drop in neutral resulting in better mpgs.
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"The only real mistake is the one from which we learn nothing."
- Henry Ford
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