I just did some testing myself...
Stock MAF and stock SVT airbox: average of .7 at 720rpm, never dropping below .65.
Gutted MAF and open K&N: average of .63, never dropping below .56.
I used the optimizer to set the idle for a steady .70-.71 with the gutted MAF and K&N. The interesting thing is that the MAF optimizer seems to smooth the MAF's output. Instead of varying from .65 to .74, it never goes below .70 or above .71. Hmmmmm....