Using a heavy object (and it's momentum) is different than using your actual body to take out a tree. Cap didn't punch apart that Humvee.
I've seen calcs of the helicopter feat in the ton range, and Cap is as described by the directors fired up on adrenaline. Like a mother who manages to lift a car off her child (I think they used this exact comparison). That ton range is what I see comic book peak humans at. Comic book cap lifts that, and Daredevil flips a limo. And Bruce kicks a tree down.