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My limited experience with DFCO is that it varies quite a bit from car to car. For example, my 2001 Silverado 3500 6.0 gasser only actuates dfco if truck is going faster than 40 mph, and engine is above 1000 rpm. It also is slow to activate dfco; it seems to want to be sure that one is serious about decelerating to activate it. Sometimes touching the brake pedal will activate it and other times not. Another example: My 2005 Camry 4 cyl auto trans activates dfco whenever the car is decelerating. This occurs even when in cruise control. Whenever the cruise lifts off the accelerator the dfco is activated. I like it.
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