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The World's Fastest Indian

is gaining fast on previous New Zealand homegrown box-office champs and may become our biggest domestic hit.

The film about Invercargill motorcycle legend Burt Munro has grossed $6 million in local ticket sales - representing more than 400,000 tickets - since its release in October. That makes it the third-highest grossing NZ film ever, behind

Once Were Warriors

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($6.8 million) and

Whale Rider

($6.4 million). With attendances still high, its distributor says the film is well on its way to top the chart.

The World's Fastest Indian

is also the third-highest grossing release of 2005 behind the New Zealand-filmed blockbusters

King Kong

and

Narnia: The Lion, The Witch and the Wardrobe

.

Meanwhile, TVNZ has scheduled a behind-the-scenes documentary,

The World's Fastest Indian - The Burt Munro Story

, to screen on TV One on February 4.