Did a 2500mi road trip this past week. Out to Colorado & then back to Wisconsin.
Was averaging 22-26 mpg. -Nebraska seems to have crappy fuel, had lower mileage both ways after filling up there.
Had just had my oil changed the week before & the dealer filled the DEF for me - used about 40% of it over this trip, was still at 25% before the oil change with around 4850mi.
My adaptive cruise disabled itself at one point - right after the sun came up heading into it. Not sure if that caused it, after stopping to fill up about an hour later it was working again.
There seems to be a mileage point at which it will do a regen, whether the DPF is at 100% or not. Driving I-70 over the continental divide actually had the soot load going down without a regen. After about 4 hours of driving seems to also have the DPF soot load hold pretty steady or decrease.