Specification	Importance
Antiknock Index (AKI)   Research Octane Number (RON)   Motor Octane Number (MON)	Low-to-medium-speed knock and run-on High-speed knock/Part-throttle knock
Fuel Volatility   Vapor Liquid (V/L) Ratio   Distillation   Vapor Pressure(RVP)	Vapor Lock Cool-weather driveability, hot start and hot driveability, vapor lock, evaporates lisses, crankcase deposits, combustion-chamber and spark-plug deposits. Low-temperature starting, evaporative losses, vapor lock
Copper Corrosivity	Fuel-system corrosion
Stability   Existent Gum   Oxidation Stability	Induction-system deposits, filter clogging Storage life
Sulfur Content	Exhaust emissions, engine deposits and engine wear
Mettallic Additives (lead & Others)	Catalyst deterioration (unleaded vehicles)
Temperature for Phase Separation	Water tolerance of blended fuels

Charts and tables for this article are taken from Changes in Gasoline II Technician's Manual, Downstream Alternatives Inc., 1995.