 In response, as full-size car lines completed their model cycles, General Motors, Ford Motor Company, and Chrysler Corporation sought to introduce full-size product lines with increased fuel efficiency while preserving interior dimensions as closely as possible.In 1977, General Motors became the first American manufacturer to introduce downsized versions of its full-size product line.By the early 1980s, the downsizing practice had expanded to nearly all size segments as product lines completed model cycles within each company.