"Think of the national 55 mph speed limit, imposed in 1974, also in the name of energy efficiency. Congress repealed it in 1995. Think of the metric system, pushed in the Metric Conversion Act of 1975, again in the name of efficiency. It never quite caught on. Think of, for that matter, the three-pence-a-pound Townshend duty on tea. Was that the end of the world? No, but it was the principle of the damn thing."