by an April release and yet another gasoline shortage during the same time, over 800,000 Citations were sold by Chevrolet for the model year. However, as the second gas crisis created demand for more fuel-efficient vehicles, GM was left with significant shortages of 4-cylinder engines, leaving some customers to wait several months to receive their vehicles. Before the fuel crisis, Chevrolet had anticipated 70% of customers purchasing the V6 engine option, leading to production lines unable to keep up with demand for four-cylinder models. In an extended 1980 model year, Chevrolet would sell over 810,000 examples of the Citation; in addition to making for one of the most successful product launches in General Motors history, the Chevrolet Citation would become the best-selling car in the United States in 1980. 1981 For 1981, following its successful model launch, the only visible external change that the Citation received was a somewhat larger grid pattern for its front "eggcrate" grill and amber rear turn-signals. Otherwise there were no visible external changes. The two-door coupe was dropped from the model line (in response to slow sales) with all Citation models offered as hatchbacks. The X-11 model now offered a more powerful engine than other Citation models, including a 135 hp "high output" 2.8L V6. In the compact market segment, the Citation and the rest of the GM X-car line saw the introduction of their closest competitor, the Dodge Aries/Plymouth Reliant (the Chrysler K-Cars). Marking the transition of front-wheel drive for Chrysler, the K-Cars offered notchback sedan and station wagon models that were unavailable in the Citation line. 1982 For 1982, the Citation underwent a minor exterior revision, replacing the eggcrate grille with a horizontally-slatted design (similar to the Malibu). Multiple upgrades were phased in to improve both drivability and fuel economy, with the 2.5L engine receiving fuel injection and low rolling-resistance tires were added to all Citations (including the X-11). As a running change during the model year, the two-door Citation made its return after its temporary withdrawal. During the model year, Chevrolet introduced two front-wheel drive model lines that would significantly affect demand for the Citation. Replacing the Monza, the J-body Chevrolet Cavalier subcompact offered its own coupe, hatchback, sedan, and station wagons configurations. Phased in to replace the Malibu, the A-body Chevrolet Celebrity was offered as a sedan and station wagon; technically a mid-size car, the Celebrity shared its chassis (including its