Number on pumps (6)

I believe the answer is:

octane

(Other definitions for octane that I've seen before include "Petrol quality rating" , "Flammable hydrocarbon - at once (anag)" , "One cat with hydrocarbon compound occurring in petrol" , "Hydrocarbon present in petrol" , "A liquid hydrocarbon found in petroleum" .)

I've seen this clue in the Newsday.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.