Driving the 2008 Mercury Sable around San Francisco, we considered painting it yellow, putting a light on top, and starting a career as a taxi driver. The Mercury Sable, brand engineered from the Ford Taurus, is a big sedan with a huge amount of trunk space. The car seems reasonably well-built, with good interior fit and finish, while its V-6 engine gives it enough power to get around. But the car offers a completely characterless driving experience, with poor powertrain response and loads of understeer. One of the key reasons we wanted to review the Mercury Sable, and its most redeeming quality, is that it came with the Sync system coupled with navigation. Previously we had tested the Sync system in the Ford Focus, and had to rely on a minimal radio display for information on our connected devices, but the navigation system's LCD in the Sable formed the basis for a more usable interface.