Not exactly, but when we first put the single on my car, (T67 with PE650's), I had two maps done for my E-manage. The race fuel map was set-up at 1.8 bar of boost, and the fuelling showed no signs of dropping off. (I'm purposely not quoting any power figures ).
However, at TOTB last year my pump started to die and couldn't flow enough fuel to keep up with 1.7 bar. It was immediatly apparent there was a problem as car was running lean after 4krpm. No matter what fuelling adjustments I made, it would still run lean. After changing the pump, all was well again. (well, it wasn't, 'cause I'd adjusted the E-manage to chuck more fuel in, so it's initial run was stonkinly rich!).
So whilst there's no actual measurements taken, it can be fairly obvious.
Edited to add, you could also see the fuel pressure increasing as boost increased to a point, then the fuel pressure started to drop off as the pump couldn't keep up...