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my tests go as such. I try to take all human interaction out of it. I have a stretch of interstate that is close to my house. I get up to 60 mph and at a designated point I reset my scangauge. and then 15 miles up the road I look at the scangauge at the second point and record that. I then get off the interstate and turn around and get back on heading the other direction. I get my car up to 60 and resume the cruise and at the same point I stopped the first test I start the second test. I then average all my A-B runs and my B-A runs to find the average for both and then average those together to get my averaged A-B-A. My previous best which was last thursday was 47.5. I added that spoiler on sunday and hadnt had a proper chance to test it until this morning I did two A-B and two B-A runs and the total average was 51.9 for A-B and 50.2 for B-a so the A-B-A was 51.
The wind started to pick up so I wasnt able to take the spoiler off to do runs without it so I'll get back to you.
its fastened to my deck lid with some 1/4 inch bolts through the holes for the stock spoiler. The spoiler itself is made with a sign material thats aluminum with plastic sandwiched in the middle. I actually have like 8 more 4x8 sheets of it if anyone is near Central IL and whats some. Its really light and stiff. Makes awesome bellypan material.
There are no supports. Its plenty sturdy enough without them.
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