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DFCO = Deceleration Fuel Cut Off
There is a 2 mile section of road that I drive on between Baltimore and Washington that is slightly down hill. When I stay in gear in this area, I typically loose about 5 mph and gain 4 mpg. When I stick the car in neutral, I gain 2 mph and gain 4 mpg. I bet DFCO would be far less useful on a flat stretch of road.
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