A ride around the block in a 1996 Audi A6 Quattro Avant with 6 to 10 inches of fresh snow before the streets are plowed. The snow is a "heavy powder" (about 10 lbs on a heaping shovel). The tires are about 4 months old with a winter-friendly tread (still no road-noise like the jeep has). Update: The check engine light went out on the next tank of gas. No more gas under 91 octane.