NSW Premier Barry O'Farrell believes Australia has an "unacceptable" drinking culture but has stood by his government's efforts to quell alcohol-fuelled violence since the tragic death of Sydney teenager Thomas Kelly.

On Tuesday Fairfax Media revealed that the man who has admitted to Thomas' manslaughter had "pre-fuelled" on double-strength vodka drinks on his way to Kings Cross with friends on that fateful night in July last year.

"There is a drinking culture in this society, not just in NSW but across this country": Barry O'Farrell. Credit:Rob Homer

An agreed statement of facts tendered to the NSW Supreme Court revealed that police estimated Kieran Loveridge had consumed about six Smirnoff Ice Double Black cans in less than two hours, each can containing 1.9 standard drinks.

But the statement also revealed he had not consumed a drink in Kings Cross, the scene of his violent, fatal and unprovoked attack on Kelly, and four other assaults.