Odd breed, the Japanese midsize premium sedan. Sophisticated to a fault, often heroically optioned and typically fitted with achingly refined V-6s or V-8s, they are perennial dogs in the market. Toyota Motor Corp.'s mighty Lexus Div., now moving into the third generation of its GS lineup, has managed nothing more than a surface scratch in the market dominated by Mercedes-Benz's E-Class and BMW's 5-Series, with minor roles played by the Audi A6 and Cadillac's STS.
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