The Brazilian grandsons of two-time Formula champion, double Indy 500 winner and 1989 IndyCar champion Emerson Fittipaldi shared the track for the very first time on the 1.7-mile short course at Sebring International Raceway on Wednesday.
Enzo, 22, teamed up with DCR as Pietro, 27, had his first outing in an IndyCar since the 2021 Indianapolis 500 after signing a deal with Rahal Letterman Lanigan Racing last month.
Enzo Fittipaldi currently sits seventh in the standings with one round to go of his second full season in F2, having broken his duck at Spa.
Speaking to Autosport, he said he had "got up to speed very quickly" in the test using up five sets of tyres and completing "many long runs".
"I can say it was a success and I had a really good time," the Red Bull junior said. "The speed was there right away. So yeah, I was very happy about that."
One of the more unique differences Enzo found was how the IndyCar's Firestone tyres behaved compared to the Pirellis on his F2 challenger.
"The way you build the tyre energy, the warmup procedures are completely different," Enzo said.
"With IndyCar, it's just flat-out right out of the box really. No rules whatsoever.
Source: Autosport