Autos in a Chinook
G'day,
Just in case you're interested...
Autoration in a Chinook (which autos like a brick, incidently) is done at 100 KIAS for best range and 70 KIAS for minimum ROD.
From the manual, from 2000' you can expect to travel about 1.4nm at best range and 1.1nm at minimum ROD.
Cheers
CB