well we shall see if i get any improvements, im not really worried about the a/c because i live in seattle and there are only about 60 days or so that i need it.
i was doing both the ud pulleys and efans for mpg gains (if any) because my mileage is really in the gutter.
i honestly hope that it helps because i drive at least 35 miles a day and im putting more miles onto the truck than i want to. now i would be ok with this if i start to get an increase in gas mileage. im only average maybe 13 mpg per tank, getting to 15 would be great.
if it doesnt really help then ill be a little mad because of all the money ive spent on mods i could have bought a cheap little commuter car but oh well at least my truck could probably beat a rice rocket if i pulled up to one. that makes the mods worth it