Crossword Genius

Petrol unit (5)

Ross

I believe the answer is:

litre

'petrol unit' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for litre that I've seen before include "One cubic decimetre" , "Unit of capacity in metric system" , "Metric liquid measure" , "Fluid measure" , "non-imperial measure" .)

I've seen this clue in The New York Times, the Sydney Morning Herald and the LA Times.
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