Crossword Genius

Gas pump number (6)

Ross

I believe the answer is:

octane

'gas pump number' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for octane that I've seen before include "One cat (anag.)" , "Ingredient of petroleum" , "Anti-knock rating" , "Petrol quality rating" , "Hydrocarbon found in petrol - at once (anag)" .)

I've seen this clue in The Wall Street Journal, the Penny Press and the King Feature Syndicate.
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