Maximum Regen Efficiency

This is probably relevant to any 3rd Gen Prius, but since the testing was in a v(agon) I am posting in this sub-forum.

I have the Torque app, and I know I can ask OBD for the current flow into the battery while I am braking. To have another data point to compare, I took advantage of a hill I drive down a couple days a week where I keep my speed below 45 so the ICE is not spinning, and collect regen leafs. Google maps gave me the distance and elevation drop, so using energy = m*g*h at

m = 1550 kg
g = 9.8
h = 76 meters

I calculated 320 Wh of potential energy.
Wayne Brown calculated 150 Wh to travel 1 mile at ~ 40 mph on level road
I collect 3.5 leafs of regen, equal to 105 Wh.

All told, regen collects 105 of the 170 Wh available, equal to 61.7% collection efficiency.
This should be viewed as just about a best case scenario, but it is terribly impressive none the less.

Does it about match what others have measured, or read ?