Greg Inglis scored a hat-trick of tries in the crushing win over England
Australia coach Ricky Stuart says his side will continue to "go for the throat" following their 52-4 destruction of pool rivals England.
The in-form Kangaroos, hot favourites to defend their crown, ran in nine tries at the Telstra Dome in Melbourne.
"You certainly don't predict those scorelines," said Stuart.
"We'll keep our feet on the ground and look for parts of our game to improve. We've got to have a relentless attitude and go for the throat."
Australia followed up their opening 30-6 rout of New Zealand with an even more emphatic hammering of England in front of a bumper 36,297 crowd.
Heroes of their nine-try success were full-back Billy Slater and centre Greg Inglis, who both scored hat-tricks, while Scott Prince marked his late call-up in place of the injured Johnathan Thurston with eight goals from 10 attempts.
We have had two good wins but the World Cup is decided in the final and we have got to get there first
Leading 22-4 at half-time, Australia cut loose in the second half, with second rower Anthony Laffranchi scoring a second try on his second Test appearance and winger Joel Monaghan getting in on the act.
"I have complimented the players on their professionalism and the way they played for the full 80 minutes," said Stuart.
"There were some stages in the first half where we really had to hang in in defence but you saw some exceptional individual attacking flair.
"What you saw tonight was nothing short of brilliant, some of the best pieces of individual talent I've seen at this level of football.
"In saying that, we've got to make sure we go forward and keep on improving."
Australia are now guaranteed a place in the Sydney semi-final on 16 November, with Stuart hinting he will rotate his squad for next week's final group game against Papua New Guinea in Townsville.
Sunday's emphatic scoreline will present the World Cup organisers with a difficult task maintaining interest in the tournament.
But Australia captain Darren Lockyer insists his side are not getting carried away by their impressive start.
"We have had two good wins but the World Cup is decided in the final and we have got to get there first," he said.
"It was tough in the first period. England were attacking but we held our line and I think that was the turning point.
"You do have to roll the sleeves up and play it tough but at the end of the game the scoreline ran out."