It's not just the track but the country as a whole that has impressed the speed king.
"If you compare the circumstances in India and Europe, they are very different. But people here are so happy and warm-hearted. In Europe, expectations are very high and money plays a big role. I think expectations are fairly low here. Money is not that important," he added.
Ferrari's Fernando Alonso, who drove brilliantly to finish second, kept up the pressure. Red Bull's Mark Webber clung on to third place.
Vettel, who leads the drivers' championship by 13 points with three races to go, is chasing a title hat-trick.
Though not as popular as last year's inaugural edition, which saw an attendance of 95,000, Sunday's Grand Prix managed to pull in 65,000 spectators - enough to cause traffic jams near the venue in the evening.
Several Bollywood actors and sportspersons also turned up for the race.