Number on a gas pump (6)

I believe the answer is:

octane

(Other definitions for octane that I've seen before include "One cat with hydrocarbon compound occurring in petrol" , "chemical" , "Hydrocarbon present in petrol" , "Hydrocarbon found in petrol - at once (anag)" , "Anti-knock element in petrol" .)

I've seen this clue in the Newsday.

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