Yes Martin, I agree you can't downsize everything to flying tests charts, the pilot is the most important part of the equation, and the circumstances also : when a plane started the fight unspotted, with an energy advantage, the charts meant nothing.

But on the other hand, you hardly can measure pilots skills and circumstances.

About the FW-190D9, contrary to some beliefs, it was not an high altitude fighter. It reached it's peak speed at 6.000 m. Above this, the Mustang was faster unless WEP injection was used. As an example, without WEP injection, the P-51D was about 60 kph faster than the Dora at 8.000m

The Tempest was as fast as the FW-190D up to 3-4000 m, and slower above this.

__________________
Children of rape and incest must live, their fathers must fry on the electric chair.
21st century FTW !