An octane rating is the primary measure of a fuel's stability, and is determined by judging how much pressure is required for a fuel to spontaneously combust within an internal combustion engine.

A more accurate way of defining octane ratings is that they measure a fuel's resistance to spontaneous ignition within an ...

One of the main issues with flex-fuel engines is that the various fuels have different combustion characteristics (burn rates, octane ratings combustion temperatures) and it's difficult to get a ...