How hard would it be to add a feature for the driver to be able to turn on and off the torque-sleep for the (I think) rear motor? By only using one of the motors, wouldn't that improve efficiency (but sacrifice performance)? I akin this to my wife's 2004 Jeep Wrangler. It's in 2WD all the time - saving gas. If we need it, we put it in 4WD, but normally remains in 2WD. My Jeep SRT8, on the other hand, was all-wheel-drive all the time - thus getting the whopping 11 MPG. The logic seems to lead to the ability to turn off one of the motors if you're heading on a long trip, or just want to save the range. What am i missing?