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I calculated the Cd using the coastdown method described at Instructables.com. I'm located in the upstate of SC, which is at the opposite end of the state from Myrtle Beach, but if you want to drop by to take pics, its ok with me. Small-scale roughness doesn't increase drag and can sometimes decrease drag as with the rough skin surface found on sharks. I need to have some clearance between the wheel boattails and the tire so when my tire tracks lifts some road debris up from the ground and throws it into the air it doesn't get jammed in between the tire and the boattail. Also certain types of wet snow can be picked up by the tires and packed into the wheel well.
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