our type 150 extra drag counts with the gear down. Its Draggy.
in terms of speeds, have a think of the drag curve vs ias without gear.. add alll that parasitic drag and both your Vimd and LRC speed are both going to go up as the tangent of and the inflexion point of that curve will move to the right. by how much will depend upon how draggy the gear is.
i know its hard to believe but 180% definately sounds about right and why we dont put it down till 4 nm to be more fuel efficient.