Haas showed strong reliability in the pre-season testing in Barcelona and with quick speed as well.
Magnussen's best lap-time from the test's final day on Friday was 1:17.565 - which was under a second slower than pace-setter Sebastian Vettel's lap-time.
"Overall, I think it's been a productive two weeks in Spain, today's been another good example of that," the Haas driver said to The Checkered Flag. "From the start, the VF-19's felt good, and I can see how we've continued to make progress each day in terms of balance and performance."
Throughout testing, the Dane completed 403 laps - which was four laps less than his team-mate Romain Grosjean - with the American outfit finishing seventh in the total mileage table.
"Of course, you never get enough miles in testing, that's just the way it goes, but I'm happy with what's been achieved," Magnussen continued. "There's a lot more work to do before we hit the track in Melbourne, but from my side, I cannot wait to start the season and go racing again."
Haas finished in P5 in the constructors' championship last season - finishing 29 points adrift of fourth-place Renault.