Here is few pictures of my 3d printed aero mirrors, no blind spots with these:
Those will lower the frontal area in normal european car for 0.03 m2 and Cd 0.01-0.03 depending on the vehicle. In fuel consumption that means 0.1 liter less fuel burned at 100 km/h speed.
Mirror can be downloaded here:
https://grabcad.com/library/aerodyna...ror-for-cars-1