Any isomeric paraffin hydrocarbon with the formula C8H18, found in petroleum, used as a fuel and solvent.
With highway gas you usually have the choices of 87, 89 and 92 or thereabouts at the pump. High octane fuels will have a higher number such as cam2 which is 110.
When you pull up to the pump and the numbers on the pump are 87, 89 and 92 octane, it's how many hydrocarbons are in the fuel.
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