General Motors’s Active Fuel Management (AFM) technology utilizes hydraulic valves, solenoids, and advanced software to shut down half of the cylinders in a V8 or V6 engine to save fuel. The system debuted in 1981 on the Cadillac L62 V8-6-4 and was called displacement on demand (DoD). Unfortunately, the Cadillac technology was ahead of its time, and there wasn’t much computing power to make the DoD system work reliably. GM’s displacement on demand came back in 2003 with faster
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