In the time period that muscle cars were made in, gasoline consumption was not a problem. The United States had a lot of resources. But as the years went on, the realization that gas was a limited resource put muscle cars in a bad position. Air control laws became stricter, meaning that the gases emitted by these vehicles had to be cleaner. Already, muscle cars had horrible fuel economy and were not made to air control specifications. In 1973, there was an oil crisis that consequently impacted the American economy. "The Organization of Arab Petroleum Exporting Countries (OAPEC, consisting of the Arab members of OPEC plus Egypt and Syria) announced, as a result of the ongoing Yom Kippur War, that they would no longer ship petroleum to nations that had supported Israel in its conflict with Syria and Egypt (the United States, its allies in Western Europe, and Japan). About the same time, OPEC members agreed to use their leverage over the world price-setting mechanism for oil in order to raise world oil prices." Though the crisis lasted but a few months, it exposed America's growing dependence on foreign energy sources. Because of this embargo, it was decided that muscle car production had to be put to an end, and smaller, more economic cars were to take their place. By the mid 70s, muscle cars have faded from the roads. This was definitely a let down for the automobile world.