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I folded in my mirrors like that on a road trip. Didn’t noticed any mpg improvement. It could’ve been in my head, but it seemed like I was getting worse mpg than with them out, it’s hard to track mpg improvements with my Hyundais system. There was a lot more wind noise. It had a deep base drumming and flapping/pulsing sound and I eventually just put the mirrors back out during that experience. I’m assuming drag wasn’t improved if the wind noise got unbearable. Actually removing the mirror and putting a small cover over helped drag and absolutely no wind noise
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