Torquing Chevy Volt axle nut to 185 lb.ft without a torque wrench

Spec calls for 185 ft.lb, and my torque wrench only goes to 150.
Torque= (lever arm) x (force)
I weighed 189 lb, so I used that as (force). Solving for (lever arm)
(lever arm) = (torque) /(force) = 185/189 = .9788
That's in feet, so x12 it's 11.746. So I marked the handle at 11 - 3/4"
Stepped on the rope as it's narrower than my foot, so more precise.
Force of gravity is straight down, so the wrench handle needs to be close to level.