 Replacing the Chevrolet Nova, the Chevrolet Citation (alongside the Buick Skylark, Oldsmobile Omega, and Pontiac Phoenix) shed 20 inches of length, six inches of wheelbase, and 800 pounds of curb weight.While nearly matching the Chevrolet Vega in exterior size, the interior dimensions closely matched the previous-generation X-platform sedans.While its A-platform counterpart continued through 1996, the X-platform was discontinued in 1985, replaced by several different designs.