80 knots, at a less than ground acceptable idle.
I set my engine for a lower than stable ground running idle, like maybe a really rough 450rpm, and during those tests it stayed above 600rpm per my notes. 80 knots indicated was my number once the data was crunched, but the bucket was pretty flat with not much difference 75-82 knots indicated. At 85kt it starts to brick. At 10 deg of flaps 75kt is my number. I use 10-1 as my number for glide ratio, it makes the math easier once the fan is distributing.
The data was taken between 1470 lbs and 1540 lbs, me, a little baggage and mostly full fuel.