Certain Mk2 parts seem to have extremely high drag

[jaggaaff_]

The Mk2 cockpit and the bicoupler do not seem to have unusual drag.

I've only tested the drag with the Mk2 JFT-400 fuel tank.

This is the  craft with the Mk2 fuel tank

This is a similar craft without the mk2 fuel tank

 

[KBluey]

I found the same thing.  I did a test with the Mk1 and Mk2 cockpits, made two vessels with the same amount of fuel and the same mass, tested what altitude they would reach going straight up from the launchpad.  The Mk2 cockpit reached a higher max velocity and a higher altitude than the Mk1!!  Not by much (28.6k vs. 24.2k), but that's very different than how those parts performed in KSP1.