"I want to get the best out of myself, but you have to see what the auto and engine are going to do".
In the Dutchman's hands the new vehicle, which was revealed in a dynamic interim livery, completed 30 laps of Silverstone's National Circuit on demonstration tyres during Red Bull's filming day, and afterwards a relaxed Verstappen professed himself happy that everything had gone as planned.
They will use Honda power units for the first time, and the vehicle carries Honda branding on its nose and engine cover.
"It was a very positive day so I'm happy", said Verstappen after the car's debut run.
Red Bull has a history of claiming headlines with testing liveries, which are designed not just to create publicity around the launch but also hide some of its less obvious aerodynamic features. "It was a very positive day so very happy about it".
Verstappen's hopes of a prominent title charge are set to be determined by the performance and reliability of his team's new engine partner Honda.
"So our objective very much is to try and be more consistent across all of the circuits, and hopefully with more horsepower than we had past year will only help to lessen that gap".
The RB15 vehicle was launched with temporary red-and-black livery.
We've obviously been able to strike at venues that have suited the characteristics of our auto, winning four races last year - should have been five - and three races the year before.
Verstappen, who shared the victories with Australian Daniel Ricciardo last season, has a new team-mate for 2019 in Frenchman Pierre Gasly. "And from there onwards, you just start to work together with the vehicle [to see] what you can improve".
"I want to get the best out of myself, but you have to see what the vehicle and engine are going to do". "The first two or three weeks feel like they are good to have and then after a break you want to get going". For sure there will be moments where as a team we'll make mistakes or it's maybe not going as we want it to.
Technical director James Allison said the team had worked hard on the suspension and aerodynamics to deliver a vehicle that would be kinder to its tyres than previous year and remain competitive at every track on the calendar. "Time will tell how we're going to perform".