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Piloting a factory-built Mahindra Super XUV500, Gill won nine out of 10 stages of the South India Rally to win by 1m56.5s from teammate Amittrajit Ghosh.
The 36-year-old only lost out in SSS1, the tarmac nature of the rally-opening stage working unfavourably for his full-sized SUV.
Meanwhile, Karna Kudur secured the final spot on the podium in a Volkswagen Polo, finishing 2m16.3s behind Gill.
Kudur was classified as the top-runner in the INRC2 category, while fourth-placed Aroor Vikram Rao was announced as the winner of the INRC3 category.
Dean Mascarenhas was next up in fifth, while Rahul Kanthraj and Fabir Ahmer were classified sixth and seventh respectively.
Former FMSCI President Vicky Chandhok finished eighth overall and third in class in his first professional rally in 18 years.
The Chennai native, who was piloting a Volkswagen Polo R2, topped the SSS1 but eventually finished 5m48.6s adrift of Gill
Arjun Rao and Phalguna Urs were the most notable retirees from the rally, the two Polo drivers suffering DNFs in SS10 and SS9 respectively.
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