McLaughlin, who showed startling aptitude when he drove an IndyCar on Penske simulators past year, told Motorsport.com: "It was awesome - a really great day".
A little bit of neck pain hasn't dampened Supercars champion Scott McLaughlin's enthusiasm over his IndyCar test run in the United States.
Two-time defending Australian Supercars champion Scott McLaughlin has completed his test in Indycars in Florida.
"Unreal, the vehicle is a beast". "It's everything I dreamt of".
"It's a dream come true", McLaughlin said in a video posted to his Twitter account.
"The only thing different was that my neck was getting absolutely torched with the g-loads".
The team's three IndyCar Series drivers, Josef Newgarden, Simon Pagenaud and Will Power were on hand for support and direction.
McLaughlin said Penske "hid the times" from him, which he said was "pretty smart, because I'm a bit competitive" as the squad looked to gather data from the run.
The 26-year-old New Zealander said he completed "around 140 laps" of Sebring Raceway's short course today, in a rare opportunity for a tin-top ace to try out a high-powered open-wheel vehicle.
"I think I was there or thereabouts speed-wise", he said, "but the team guys kept their cards pretty close to their chest about lap times because they didn't want me to go too hard".
"Did a good job".
"He certainly embraces new challenges and we think this is a great opportunity to utilise the IndyCar Series rookie testing program so Scott can experience what it is like to get behind the wheel of one of our Indy cars".
"Do that many laps and you're gonna be spent tonight", Power added to give the young Kiwi some perspective. Asked if he would consider open-wheel racing, despite having never raced a single-seater more powerful than Formula Ford, McLaughlin was cagey.
Team Penske advisor, four-time Indianapolis 500 champion and Inycar legend Rick Mears was also at Sebring to help McLaughlin during the test.
The New Zealander recently married his wife Karly Paone, who is American, and the couple have spent most of the Supercars off-season holidaying in NY.
While McLaughlin will now return to Australia for the Supercars championship starting in Adelaide at the end of February, he hinted an American stint was firmly on his mind. "But I'm really proud, and it's a big tick on my bucket list for sure".