It's probably best that me and you know about the three numbers you see at a gas station pump. (87, 89, 93) those three numbers are the Octane Rating. What that is, is in gas, it's octane rating refers to it's resistance to auto-ignition. If you are clueless, Auto-ignition occurs when the fuel and air in a cylinder is compressed alone, without any type of spark. Highly, this can contribute to Engine Knock, and is highly destructive. In SUV's, or vans, (which have "high performance engines,") usually have higher compression, which takes higher octane fuel to prevent auto-ignition.
To tie into fuel, the ratio in gas to oxygen an engine needs is about 1:14. Each cylinder needs fourteen parts of oxygen.