I believe that is extreme circumstances. The average owner of an EcoD, Dmax, PStroke, or Cummins will never experience that high level DEF consumption.
Yea this whole cloak & dagger regen situation is irritating to me. The other day I found myself kicking it down to 7th on a flat 25 mile stretch to keep the RPMs above 1500 thinking maybe it could do its thing. Ironically, the instant MPG readout didn't even flinch nor did any of my gauges. Truck acted like it was perfectly content purring along at 1800 vs 1400 RPMs.I know. I was just trying to be funny. I used to drive a sprinter and Isuzu cube truck for work. I don't remember exactly how much def I used. Mostly because it wasn't me paying for it. But I don't remember it being as extreme as that.
One cool or irritating feature depending on how you look at it. Was the Isuzu, when it wanted to regen a light would pop up on the dash. Iirc you had about 200 miles to put it in park and press a button on the dash. The truck would automatically idle up. Like way up! For as long as it took to clean out the filter. Usually about 15 minutes.
You could interupt this if need be too. It was a pretty slick system.