Filling station
Octane

In Australia, gasoline is unleaded, and available in 91, 95, 98 and 100 octane (names differ from brand to brand). Fuel additives for use in cars designed for leaded fuel are available at most filling stations.

In Canada, the most commonly found octane grades are 87 (regular), 89 (mid grade) and 91 (premium), using the same "(R+M)/2 Method" used in the US (see below).

In China, the most commonly found octane grade is RON 91 (regular), 93 (mid grade) and 97 (premium). Almost all of the fuel has been unleaded since 2000. In some premium filling stations in large cities, such as PetrolChina and Sinopec, RON 98 gas is sold for racing cars.

In Europe, gasoline is unleaded and available in 95 RON (Eurosuper) and, in nearly all countries, 98 RON (Super Plus) octanes; in some countries 91 RON octane gasoline is offered as well. In addition, 100 RON is offered in some countries in continental Europe (Shell markets this as V-Power Racing). Some stations offer 98 RON with lead substitute (often called Lead-Replacement Petrol, or LRP).

In New Zealand, gasoline is unleaded, and most commonly available in 91 RON ("Regular") and 95 RON ("Premium"). 98 RON is available at selected BP ("Ultimate") and Mobil ("Synergy 8000") service stations instead of the standard 95 RON. 96 RON was replaced by 95 RON, and subsequently abolished in 2006. Leaded fuel was abolished in 1996.

In the UK the most common gasoline grade (and lowest octane generally available) is 'Premium' 95 RON unleaded. 'Super' is widely available at 97 RON (for example Shell V-Power, BP Ultimate). Leaded fuel is no longer available.

In the United States all motor vehicle gasoline is unleaded and is available in several grades with different octane rating; 87 (Regular), 89 (Mid-Grade), and 93 (Premium) are typical grades. At high altitudes in the Mountain States and the Black Hills of South Dakota, regular unleaded can be as low as 85 octane; this practice has become increasingly controversial, since it was instituted when most cars had carburetors instead of the fuel injection and electronic engine controls standard in recent decades.

In the US gasoline is described in terms of its "pump octane", which is the mean of their "RON" (Research Octane Number) and "MON" (Motor Octane Number). Labels on pumps in the US typically describe this as the "(R+M)/2 Method". Some nations describe fuels according to the traditional RON or MON ratings, so octane ratings cannot always be compared with the equivalent US rating by the "(R+M)/2 method".
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