[LeanBurn]

Interesting descriptions for AT feedback. On my 09 Corolla it needs to be engaged in D so that it can engage DFCO (deceleration fuel cut-off). From highway/normal city running speeds all the way down until ~20kms/hr (15mph) once you lift the throttle...it reads zero, then at this lower speed point mentioned I can actually feel it start feeding fuel to the engine again and see that reflected on the gauges. If I put it into N it continues to consume fuel at near 1000rpm the entire time. The dash fuel consumption readout and scan-gauge II confirm this.

This DFCO is very handy in the winter as well as it acts like gearing down in a manual transmission setup and feels a lot like engine braking.

Considering this built-in feature I have no desire to turn off the engine to coast down either and my understanding of AT is that it needs to have ATF pumped through it to provide cooling and correct operation. Lastly, I would want to have full driving functionality to be safe, I feel that engine off removes this functionality.