I only use DFCO when I need to slow down. It only happens above ~47 MPH in fourth gear, but if I'm going to end up slowing more, I'll turn off OD which drops to third and keeps it going down to ~35 MPH.
Sometimes it doesn't catch, in which case I can turn off OD, tap the brake to make it happen, then turn OD back on and it keeps the DFCO going. Strange, but it works.
Neutral is definitely the way to go, though.
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