Gill, who missed Round 4 of the INRC in Chikmagalur as it was held simultaneously with the APRC, is still ahead with 50 points after winning the rounds in Coimbatore and Jaipur.
But INRC 3 leader Dean Mascarenhas and defending champion Karna Kadur are snapping at his heels with 45 and 43 points respectively.
He will have to be at his fiercest best here in Ziro, which will be making its debut as hosts in the picturesque backdrop of Arunachal's majestic mountains, as he sets his eyes on his fifth title in INRC.
"This is a wonderful backdrop for rallying and I am sure all the participants are going to enjoy driving here," he added.
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"It's a big step for us to host the Rally of Arunachal," Lhakpa Tsering of the Motorsports Club of Arunachal said. "Motorsports is fast becoming a very popular sport in the North-East and this is a good boost for al the young enthusiasts," he added.
The Team Mahindra Adventure driver, Gill, will be accompanied by his long-time navigator Musa Sherif as they grapple with the 149.70-kilometre distance, including 72 in special stages and 77.70 in liaison.
In his own class, the INRC 3, the pair has been unbeatable, winning all the three rounds for a solid 75 points.
Second-placed Saddam Shaikh is way behind with 36 points to pose any sort of a real challenge.
ARKA motorsports' Karna and Nikhil Pai are back in the fray, despite a non-finish in Round 3, the Rally of Jaipur. They clinched the top position in Round 4, the Rally of Chikmagalur, in the absence of Gill and will hope to push the champion to the edge.
Gill's teammate in Mahindra Adventure, Amittrajit Ghosh, will rue the missed opportunity in the Rally of Chikmagalur. He was in the game with a third place and a fifth-place finish in the initial two rounds. But in Round 4, his car let him down even as he was leading the pack, forcing him to return empty-handed.