Overview: Traces the history and evolution of the world’s most important fossil fuel. Without gasoline, modern life would grind to a halt. Americans use about 360-million gallons of gas every day. And though most of us could not function without gas, very few understand what it really is, how it is made, what all those different octane numbers really mean, and how researchers developed cleaner burning gasoline. All these questions will be answered as we look at the history of this “supreme” fuel.