It became clear fairly early on that the two Holden drivers would have to fight each other to become champion but van Gisbergen says they worked together for much of the season to improve their car speed - something that has set them apart from their rivals in the back half of the year.
But now it has become a two-horse race van Gisbergen says he will focus on beating Whincup.
"I can't avoid it now. We are in the running. It is a pretty good spot to be in. We have had a very good year and great results.
"He is going to be there. He won't give up, he will be attacking so we just have to do the best job we can do and fight against him."
The Aucklander has never found the media spotlight comfortable but with the success this year that scrutiny has amplified. On the outside he appears calm and measured and he says his philosophy with dealing with the pressure is simple.
"My engineer has a good saying - just control what you can control."
With a format that sees two shorter races on both Saturday and Sunday van Gisbergen can minimize the risk of a bad result with four bites at the cherry.
If he can leave Pukekohe with a lead of around 150 points in the championship he would only need to safely bring the car home in the two final races of the year in Sydney to become the first Kiwi champion since Jim Richards in 1991.