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Why do they have a plastic cover over the filter and drain plug area? Most of the underneath is covered is this to address rodents from chewing on the wiring? Several years ago I heard stories about people being stranded because the soy in the wire insulation attracted rats.
 

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Why do they have a plastic cover over the filter and drain plug area? Most of the underneath is covered is this to address rodents from chewing on the wiring? Several years ago I heard stories about people being stranded because the soy in the wire insulation attracted rats.
Perhaps for better aerodynamics.
Exactly that and in turn fuel savings... 11th gen had an ECO edition as well where most of the underbody was covered so to get the highest mpg possible...
 
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