The temperature switch to 50/50 doesn't hurt other than being a tad less efficient than driving on a single motor. The only for the car to know it's slippery is if it senses a wheels spinning or the entire car drifting sideways (it has a sensor for that). But that's too late.In Colorado at least it can be very cold with bone-dry roads, and 40F with ice patches in the shade. So not sure how the temp approach would apply.
