17.2mpg isn't bad to start with. 20mpg may be a challenge. See my sig for some ideas (I had an '03 Silverado, 4.8L 2WD ext cab, long bed).
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Originally Posted by spacemanspif
Everything said above is good info. I think most truck guys use factory F-body fans with good success. I'm not sure any e-fans pull as much as the mech fan but as we all know, cooling systems are overbuilt.
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Most truck guys use the '05-'06 full-size truck E-Fans. Silverados, Tahoes, and Burbs all switched to E-Fans in '05 and they bolt right in.
Step-by-step example here:
I installed 2006 E-fans on my 2001 - Chevy Truck Forum | GMC Truck Forum - GmFullsize.com
However, you need a harness and you need the ECU altered to trigger the fans. Blackbear is typically the easiest way to get this done.