Is it normal for an S2000 to burn through 4 litres of engine oil in 3000kms?

My oil light came on today and I checked the sump and it's way below minimum safe level. I've had a look under the car to see if it was leaking oil but didn't find anything. I've heard vtec engines burn a little bit of oil as they operate but is the amount I've described normal?

I've garaged the car and I'm going to get more oil tomorrow. I wanted to ask if there's anything else I should be checking to see if anything needs replacing.

Thanks heaps guys.