Citadel Gives Hybrid Double Meaning 4 January 1999 The Chrysler Citadel concept car. DETROIT, Jan. 3 -- Blend a luxury sport sedan with the brawn and sense of security of a sport-utility vehicle, mix in a futuristic performance powertrain, and you have the inspiration for the Chrysler Citadel concept car.  "If you own a luxury sedan or luxury sport-utility vehicle, you may be wondering what your next purchase should be," said Neil Walling,…