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An electric radiator fan is a 'maybe' in terms of efficiency. Converting fuel to electricity and back to kinetic energy isn't efficient, compared to a simple mechanical fan and clutch. If you can loose the belt you may see a gain, if your car is such that the belt's needed to run something else, there won't be much in it.
I did a rear axle to bumper pan on my van, it was super easy and the dirtiest part of the underside. The airdam probably diverts enough air that a forward pan would be of little benefit.
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