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Coasting in gear is not really coasting, since there is engine braking involved unless clutch disengaged in a manual). You can get hundreds of MPG coasting in neutral but if you are using engine braking you can engage DFCO and get infinite mileage for a shorter distance. Ideally you should be able to coast in neutral to a complete stop for the best theoretical mileage, but it just doesn't happen to most people in typical traffic.
I coast in neutral when it will not aggravate other drivers, then use engine braking when I need to slow down more rapidly.
regards
Mech
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