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Well I decided to just go ahead and try to extend the factory OEM air dam so that it would extend low enough to provide some cover for the low hanging bits on the truck. I don't understand GM at all on this air dam. Why would you add an air dam that comes no where near low enough to provide coverage under the truck? It is a 3.25 inch high dam that only about 2.75 inches extend below where the stock bump lip hangs down. GM states the ground clearance is 7.9 inches. I show about 12 inches to the bottom of the front bumper. So the factory air dam comes no where near covering the low hanging parts.
So I extended the factory air dam by about 3 inches. Working with the lawn edging is no fun and it didn't want to conform to the factory air dam without puckering up. So I tried to address this by using bolts and nuts every couple of inches with a washer. That helped a lot with the puckering, but now the bolts look horrible. So I slapped some gorrilla tape over it and that looks just as bad. So I give up, it just will look bad until I can think of better solution. All those bolts and washers were MEGA overkill, but I knew that double sided tape wasn't going to cut it. So I will have to give this some thought if I decide to revamp this thing.
So I went ahead and mounted the dam up and I have about 7.5 inches of ground clearance. So I think that should cover the low hanging parts and help somewhat with the FE. We will see. Hopefully I will get some time tomorrow to see how the combo of the tonneau cover and the air dam affect my FE.
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