As predicted, efficiency effectively reduced the cost of energy. This is good. And as expected, old technologies and activities use less energy. But as the economy grew, we found many new uses and activities for these technologies. New technology and activities are part and parcel of the reason an economy grows.
Energy use goes down only in a stagnant or depressed economy.
In fact, the Information Age will increase our use of oil. For one thing, information technology functions like an economic lubricant. Economic growth here, and especially in developing nations, means more energy use, even if for no other reason than people will buy cars as soon as they can afford them, and their native lands will create the industrial infrastructure to fabricate them. Then too there is the universal lock-step relationship between economic growth and electric use, which drives a global appetite for conventionally fueled power plants. Airplanes and ships will remain oil-powered for a long time.