A few weeks ago we went up to our lodge at Dodge Ridge(across the parking lot from the resort). We didn't take the Tesla because the right rear door window had shattered the night before so we had to take the Prius. There's a steep driveway covered with ice. Even with tire chains the Prius couldn't even come close to making it up. Yesterday we went up again for a Monday ski day. Conditions were the same with just as much ice (even more actually) on the driveway. But the Tesla went up without any slippage and did so without tire chains. It's like the ice wasn't even there. So my question is, without a locking side to side diff, how can the D cars be so good on ice on a hill? If one wheel slips even just a little, that wheel should get all of the power and the other wheel on the other side should be stuck. This is why limited slip diffs are better than open diffs for traction in snow and mud. Does the insane amount of micro torque control compensate by preventing the slip from even occurring? Mind you, I'm not complaining.....at least about the Tesla. The Prius on the other hand is officially the worse snow car on the planet!