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Engine on coasting in an AT equipped car or truck depends on the vehicles ability to reengage the transmission without any trauma. My 08 Altima would reengage easily with almost no perceptible deceleration. It did this by engaging in the highest ratio (CVT) with the torque converter lockup disengaged. Even at 70 MPH the initial engagement would get the RPM to increase from idle (700) to about 13-1500, then after about another second or two the RPM would increase to the same level as it was when you were driving at the same speed. Worked fine up to 80 MPH. I never tried it above that speed.
regards
Mech
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