I don't have a direct measurement but this is my experience:
over 140sqm (which takes me around 45 minutes at my pace) I will go through around 600ml of fuel (generally closer to 550)
I recently took the back to dirt before a topdress and the front down relatively violently - I used 3l over 350sqm (which included taking the verge from 4 inches tall to dirt (210ish sqm))
