does dual exhaust increase your gas milage?

has anybody put duals on their truck? if so have you noticed an increase in mpg? because i have the pipe to do it and before i spend the money to bend the pipes i wanted to know if it will be a good switch from single to duals.i would greatly appreciated

 

switching to duals will not increase your mileage. a higher flow muffler,like the dynomax super turbo will...to a point anyway. duals can actually decrease your torque...make you lose a few hp.