•Volatility is a fuel ability to turn to vapor. Gasoline must vaporize quickly after it is mixed with air in the throttle body or intake manifold. Otherwise, drops of liquid gasoline enter the cylinders that will wash the lubricants oil off the cylinder walls. This increases wear of the cylinder walls, piston and rings.
•Gasoline that does not vaporize will not burn. It leaves the cylinder in the exhaust gas and pollutes the atmosphere.
•Too low volatility makes the engine difficult to start.
•Too high volatility may cause the vapor lock in the fuel line which stalls the engine or stop.