How much power can be gained from eliminating the stock belt-driven fan, and replacing it with an electric fan setup?

Do you think this will improve gas mileage any as well?

Are there any companies/people that make lightweight or underdrive pulley pulley sets for the 3.3L engines?

I've been playing with a few things to improve my gas mileage lately and I'm getting 19mpg around town. I'm going to be pumping up the tires a little more and removing my spare/jack/hitch, and maybe the roof rack (I would like to reduce the drag but I think X's look dumb without them). I will also be switching to synthetic oil this next oil change. I just changed to synthetic oil in my rear end as well. I would like to get into the 22mpg range, and maybe make a little more power while I'm at it.