Fernando Alonso has admitted his surprise at how lucrative taking part in the Indy 500 is.
The Spaniard qualified fifth, was crowned rookie of the year and retired with a blown Honda engine as he skipped Monaco to take part in the US oval race.
It emerged that he took home about $300,000 (£233,000) in prize money.
"I'm going to have to tell the guys in Formula 1," the McLaren-Honda driver is quoted as saying by German broadcaster RTL.
"It's a really good thing you have here, and I think a lot of F1 drivers will be coming soon."
The F1 season continues next weekend with the Canadian Grand Prix.
