2,4-Dimethylpentane is an alkane with the chemical formula [(H3C)2CH]2CH2.

This colorless hydrocarbon is produced in large quantities in oil refineries.

It results from the alkylation of isobutane by propylene.

[1] Often referred to as "alkylate", it is blended with other gasoline components to give a high octane fuel.

Unlike n-heptane, 2,4-dimethylpentane is a desirable fuel because its branched structure allows combustion without knocking.