The 2019 Audi A8 L sticks to an understated formula that has worked for more than two decades. Audi's biggest and poshest sedan lays a ground game for future driver-assistance and technology features. While the 2019 A8 L is new, the competition is far from it. Competitors from BMW, Mercedes, and Lexus have a head start on Audi by at least a few...
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