0 a number showing the quality of petrol by representing how well and with how much power it can make an engine work
A research octane number of 65 and volatility were low compared with modern fuels but probably suitable when considering the design of the flathead engine.
Fuel consumption increases with every unit reduction of octane number.
The octane number of any additional unleaded regular grade was left for member states to fix.
The way to increase the octane number is obviously to put in petroleum additives such as tetraethyl lead and tetramethyl lead.
The lead additive in petrol provides the octane number needed by vehicle engines.
The main decisions required were as to the number of grades of unleaded petrol and their octane number, and the precise timing for introducing the changes.
The octane number is an empirical measure of the resistance of gasoline to combusting prematurely, known as knocking.
The octane number of the alkylate depends mainly upon the kind of alkenes used and upon operating conditions.
