Ok, it's been over a week now and i have not noticed any difference in the drive of the car

Also no contamination at all the catch tank is squeak clean [LOL]
One thing has changed the reading on the MFA for fuel consumption, it's down by an average of 6 mpg, i am not saying the actual fuel consumption is less, just the reading on the MFA.
1)Could disconnecting the breather tube from the metering head have caused this false reading?
2)Also, should i have to adjust the mixture now?
Cheers