In the S10 radiator fan changes thread, I told my tale of switching my former GMC Sonoma to an electric fan. The MPG effect was negligible, but it made the truck smoother and peppier to drive, by simply removing the extra weight from the engine. It's a mod I'd recommend to anyone.
If I recall correctly, I chose my fan by looking at the electric fans on the shelf at Advance Auto Parts, and after I saw the one recommended for 4-bangers, I bought the next-bigger one. I wired it up all stupid, much to the chagrin of the mechanic who later changed my head gasket (unrelated-- I never overheated, so much as cavalier-engine head gaskets magically dissolve), but it worked really well once I got a setting chosen for the thermostat.
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