Automotive gasolines are mixtures of hydrocarbons distilling in the range of approximately 25°C to 210°C. The minimum quality requirements are determined by the adopted European standard ČSN EN 228+A1. Automotive gasolines are divided according to the minimum value of the octane number into BA 91, BA 95 and BA 98, the octane requirement is set by the vehicle manufacturer. Currently, according to statistics, approximately 97% of gasoline with an octane number of 95 and approximately 3% of gasoline with an octane number of 98 are consumed in the Czech Republic.

The octane number expresses the ability of gasoline to resist detonation combustion, which is manifested by so-called knocking. A higher octane rating means more resistance to knocking. If lower octane gasoline is used, the engine is prone to knocking. Today's engines have built-in knock sensors that help precisely adjust the ignition timing if the engine starts to knock. These engines can also adapt to lower octane gasoline. However, then the engine has weaker performance parameters and higher consumption.

To create a quality combustion mixture with air, gasoline must be sufficiently volatile. Different seasons require the use of gasoline with different volatility. For this reason, different gasolines are supplied to the market in summer and in winter. In winter, the volatility must be high enough to ensure a cold start. On the other hand, in the summer, the high volatility of gasoline is undesirable.
In the last 15 years or so, bio-components have been added to fuels. The reason is the effort to reduce CO2 production during their production. As a bio-component, ethanol is added to gasoline or ethers are added, most often in the form of ethyl tert-butyl ether (ETBE).

The labeling of automotive gasoline at gas stations is specified in the ČSN EN 16942+A1 standard.