If that was true, then gasoline would odorless, just like all the other organic compounds that end with the suffix “ane”. Methane, ethane, propane, butane, pentane, hexane, heptane, octane, nonane, decane, etc.
A mixture of 2,2,4, trimethylpentane and n-heptane is a reference fuel that gasoline blends are compared to in order to determine their octane ratings.
2,2,4,trimethylpentane is a particular isomer of octane that has a fairly high antiknock property, it’s also known as iso octane.
Straight chain or n-octane has an octane rating of nearly zero.
There are fuels that have higher octane ratings than iso-octane, methane for example.
Octane ratings higher than 100 are extrapolated by how much the power of an engine can be increased by supercharging before detonation occurs compared to 100 octane fuel.