Will adding a supercharger to a 2008 Scion XB use more fuel?

[Cool PR]

I saw this http://www.trdsparks.com/displayparts.php?Mdl_dtl=570Part_cat=3parts_id=223 8 and would install it to my 2008 Scion XB if it didn't use to much extra fuel. If I drive moderately will I get the same fuel economy as if I didn't install it?

[kelly_f_1999]

yes it will use more and really a lot more and if your going to drive it moderately then why add it