If we Disable(Remove Air vent pipe coming from Turbo) Fuel Compensator from Mechanical Fuel Pump which is couped up on top of the fuel pump, many people must have seen it, the question is=
will it increase MPG ?

It will definately decrease BOOST Pressure/advantage of Turbo, that is a fact, More Air, with Less Fuel mixture.
however, here increasing MPG is the main focus, while not hurting/damaging the fuel pump.