I got a shock at how much difference that the mirrors made, I have a route close by that has a 5km EOC stretch on it, mirrors out max 94 kph and only at one point, toward the end I restarted due to getting down to 74 kph.
Mirrors folded (mine don't fold real flush either) 101 kph for the bulk of the 5k and minimum 79 kph and no restart required.
Same route, same wheather, no wind and both runs within a couple of hours of each other.
Provisos my car has a relatively small frontal area and is reasonably aero.
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