There is absolutely no payback in gas mileage with electric fans, just some improved throttle response---you would barely feel it, if ever. You will never pay for them with reduced cost at the pump.
Ken P has a link to the drawbacks aleady posted.
The fans help a tiny bit in a 1/4 mile run if you are into that type of fun.
Do not disconnect your throttle body coolant supply unless you remember to hook it back up when it gets cold out---good point Klaus.
Guys who race may disconnect it for that little extra edge---but please hook it back up. They also ice their intercooler reservior and run a 160 thermo but these items are for another post.
Hope this helps.
P.S. It IS a 7K bus designed for good (or great--sorry off road fans) off road capability.
I have a Honda for improved "average" gas mileage on the road.
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