Akrapovic full system mileage?

For those that have installed the full system. How is your gas mileage, gone up or down. I'm most interested in the bikes sold In the USA and califoria.

personally l i dont worry about fuel
mileage
if your worried about fuel mileage
go buy a non performance motorcycle
or buy a zero electric bike
i bought the beast and added the akra
system for the smiles per miles

Joe,

I don't ride around the neighborhood or commute on my bikes. I seek out the less travelled back road. These roads are less likley to have gas station on them. So you need to have enought fuel to make it back home. This bike dose way better on gas than my 08 SDR did. Was just asking.