Prime Minister Julia Gillard and Opposition Leader Tony Abbott are leaving no stone unturned as they trawl for votes in the race to the election finish line.
Ms Gillard is getting ready for her final big pitch to voters, an address to the National Press Club in Canberra.
Before she put her case for the re-election of the Labour government, Ms Gillard met construction workers at Googong Dam, near the southern NSW town of Queanbeyan.
It is in the seat of Eden-Monaro, held by Labour's Mike Kelly and seen by many as the litmus test for who will win government.
Ms Gillard is not taking anything for granted, despite Labour having the slight edge in the opinion polls.
"This is a knife-edge election result," she told Sydney radio station 2Day FM.
"It will be a long, late night on Saturday and every vote counts, absolutely every vote.
"So it's very tough. It's very, very tight."
Mr Abbott will use his renowned stamina to campaign for 36 hours straight.
He began his morning in Brisbane, where both he and Ms Gillard on Wednesday night faced a town hall-style forum at the Broncos Leagues Club.
The 200 swinging voters gave the night to Ms Gillard, 83 votes to 75, but Mr Abbott again put in a confident performance with the punters.
As dawn broke, he visited the Brisbane Produce Market, promising to deliver a "strong finish".
"It's been a gruelling campaign, but the public expect people to work for the top job," he told the Nine Network.
"I'm now beginning a 36-hour continuous campaign."
The leaders left it to Treasurer Wayne Swan and coalition treasury spokesman Joe Hockey to slug it out over the economy.
Labour continued to hammer the coalition over the costings of its election commitments and a promise it would deliver a $A6.2 billion surplus within three years, almost double that forecast by the government.
Mr Swan told ABC Radio the government was still working through the coalition's 19 pages of costings but the errors were so massive it would take time to work through them all.
"There is a long way to go," he said.
"There are serious errors. There are mistakes, there are black holes, there are savage cuts."
The coalition says its savings are worth $A49 billion over the forward estimates, including $A9 billion in previously unannounced cuts.
