Fairing and MPG

[Nubbs]

Ok, I know the topic of MPG with the Nomad has been beaten to death in these forums but I was unable to find anything specifically stating how the addition of a bat wing fairing effects the MPG. Can someone please enlighten me on this? I already get crappy mpg (will be looking at tfi settings and cleaning the throttle body soon) SO I am just curious how the addition of the fairing will effect the average.

Thanks,
Nubbs