Well stated euromodder.
I never use engine off in my diesel Beetle with an automatic transmission because the power steering effort is ridiculous without engine rotation. Even still it's always a balance of maintaining speed and coasting. I hate having to use the brakes, so I don't get out of gear unless I judge my momentum can carry me to the stop with little speed left over. Often I will coast if I can judge the traffic will start moving again before I get there, then I can stab it back in and keep going. If not, I used too much fuel, but DFCO will at least minimize fuel use while decelerating, as it's almost zero compared to idling.
It's a good challenge; I drive a lot, and this keeps me attentive.
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I'm not coasting, I'm shifting slowly.
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