Fokker 50 mk300 question

[Echoco]

Hello, I notice the Fokker 50-100/300 has a speed of 265/285kts

ATR 42-300/320/500 is around 265/269/304kts
and 72 is 270/275kts

I was playing around with the route planning trying to see if their speed made any difference and the planner shows fokker 50 is slower. I'm guessing the planner uses the mk100 speed or maybe average speed but anyone got experience with mk300 and if the flight time change (shorter) once assigned to the aircraft or is the extra speed wasted?

[Sami]

The speeds for that matter are the same as the planes are in the same fleet group (routes interchangeable) so the "scheduled speed" is the same.

[Echoco]

thanks sami

so for f50 it use the speed of the mk100?
what about ATR42/72? there's 4 different speed there which does the game use?