Best bits: Applications of microprocessors: The `four-cylinder¿ Caddy

How do you save gasoline and cut exhaust pollutants with an eight-cylinder Cadillac? It will be easy with the 1981 models, General Motor says. They will have as standard equipment a microcomputer that will allow the engine to use four, six, or all eight cylinders, as needed. GM´s Cadillac Division says the cars will give 30 mi/gal on the highway at 55 mi/h.