The 22-year-old German, who finished second to Jenson Button in this year’s F1 World Drivers’ Championship standings, attended the Sprint Cup Series finale at Homestead, Florida.
And he was clearly impressed by the show on offer to around 100,000 racegoers, telling Autosport: "I think there's a lot of things we can learn because sometimes that's what people complain about, that Formula 1 is not exciting enough.
"Some things will always be different, because Formula 1 is just not NASCAR and NASCAR is not Formula 1, but in America they're very good at how to put the show on and put the focus on the sport, the drivers.
“It's always a huge crowd, always packed and I think this is something we can learn in Europe, to make it more interesting for that many people."
With Mercedes-Benz buying Formula One World Championship-winning team Brawn GP in the last week, there is much speculation that Vettel’s hero Michael Schumacher could be about to come out of retirement to replace Jenson Button.
World champion Button has joined McLaren, where he will team up with fellow Briton Lewis Hamilton, in a move which has surprised Vettel, who is expecting the new Mercedes team to be a force next season.
The Red Bull driver commented: "It's always a surprise if a champion, in a champion team, is leaving. You don't know if things will change completely next year, but in that regard for Brawn GP it was a very positive thing to happen that Mercedes is now taking over.”