PIANOTUNA here are the photos on my truck. I went off one of the wings on the bottom goose then snap a caulk line. They need about 3/4 inch apart they recommended a thumb space. So that is what I did they say 3 per foot, but due to how the shell is laid out I had a larger gap on the outside ones. But they should not touch.
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Steve, I have not yet, just the mileage tracker on my truck. I was getting around 10 or 11 before, coming home when checking it read 11 and 12. So millage is yet TBD. I'm going to add these towards the rear of the camper like stated on there web site. So that should reduce the drag. This is a test in progress, but as I mention above I'm very happy the wind noise as been eliminated so to speak. And bugs reduce ALOT. ART