Octane rating facts for kids
The rating is done by comparing the fuel to the mixture of iso-octane and heptane that would detonate in the same way. Such a mixture of 90 percent iso-octane and 10 percent heptane has an octane rating of 90.
Gas is available with lower octane ratings in the US than in Europe.
In Spanish: Número de octano para niños
Octane rating Facts for Kids. Kiddle Encyclopedia.