India, May 5 -- Max Verstappen was feeling a bit more comfortable in his car at the Miami Grand Prix, but the four-time Formula 1 champion still believes Red Bull has improvements to make.

After testing out Red Bull's upgrades made during a five-week break in the F1 schedule, Verstappen had his best result of the season on Sunday, finishing fifth despite spinning from second on the opening lap.

Verstappen has been a vocal critic of the current car regulations, even going as far as saying he's considering leaving the sport. He left Miami only slightly happier with the car.

"I mean, my car drives a bit better," said Verstappen, who qualified a season-best second for the race at Miami International Autodrome. "But what I said before about...