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if you don't have the mudflaps you likely have to wash your car more often
washing your car uses energy
water consumption is energy
(and don't forget the crap you are washing into your local creek, if you are washing at home) (but don't get me started on the environmental advantages of commercial car washes versus the home approach - still, I wash at home around 50% of the time)
Mudflaps will have no effect on MPG, BUT they will help protect your car from small rocks, etc. My previous car was a Honda Fit Sport and I didn't have mudflaps...I had small dings along the bottom side of the car due to rocks and other debris.
I had flaps installed on my Prius, ding and dent free! I also had side moldings put on my doors because people don't care if they hit your car door or not!