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I've put my mirrors back on recently, and I can still average 35 a tank pretty regularly.
This is only a few % lower than my best without the mirrors. That said, I tested at nearly 1.5 mpg difference at 55 mph without the mirrors.
There were other problems though with not having them. Like pulling out of a parallel parking spot in traffic, or backing up into a garage. The biggest one for me was above 65 mph my windshield seal made a strange buzzing noise with the mirrors gone. I guess the air was still turbulent there or something? Then after 4000 miles my camera mirror just quit working. I believe the camera works fine still, but the screen does not. Was cheap anyway.
But anyways, it's an awful lot of work to reshape them for not a lot of improvement. Driving style will make a much more meaningful increase. And at the same time, I still want to see you do it, just seeing how nicely you did the grill block. Go for it.
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