On a technical note, as Ryland said, an e-fan is "less efficient". However, the key is that it only draws power when it's turned on, which isn't all that much. A mech fan has a parasitic load all the time, which is why an e-fan gives better mpg despite the conversion losses.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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