The fastest of the Lexus GS series is a hybrid. At 5.2 seconds to 60 mph, the GS 450h beats both the GS 460 and GS 350. And it does it while getting better mileage than its model mates. That's the kind of best-of-all-worlds powertrain we can live with. Those numbers also make the advantages of a hybrid abundantly clear. Now if Lexus would get around to updating its cabin tech, the GS 450h would be just about perfect.