 The University of Bath published research carried out by its Powertrain and Vehicle Research Centre which demonstrated that it is possible to reduce engine capacity by 60% and still achieve the torque curve of a modern, large-capacity naturally-aspirated engine, while encompassing the attributes necessary to employ such a concept in premium vehicles.From 1977 to 1982, in order, General Motors would physically downsize its full-size, intermediate, compact, and subcompact vehicle product lines as each platform completed its model cycle.The strategy included vehicles from every General Motors division (Buick, Cadillac, Chevrolet, GMC, Oldsmobile, and Pontiac).