Russian refiners currently provide three grades of gasoline for commercial and industrial vehicles: A-76, A-92, and A-95.
Whereas A-76 gasoline fuels Russian automobiles of older vintage and medium to heavy-duty trucks, A-92 and A-95 can be used for automobile imports and Russian vehicles in general.
The definition of Russian gasoline grades differs slightly from that of the US. The US classifies its gasoline at the pump using an antiknock index, equivalent to the average of research octane number (RON) and motor octane number (MON). That is, (RON + MON)/2.
In Russia, the A-76 grade gasoline exclusively uses the MON test parameter to define "76."
For grade A-92, on the other hand, the minimum RON is 92, and the minimum MON is 85. Thus, in accordance with US notation, Russian A-92 gasoline has an antiknock index of 88.5. That is, (RON+MON)/2 = (92+85)/2 = 88.5.
For grade A-95, the minimum RON is 95, and the minimum MON is 85. Thus, according to US notation, the antiknock index is 90.
