Seem to have gotten around ~2 MPG from the passenger mirror delete and ~1 MPG from the driver's mirror reduction. Testing was rough though so real data might be lost to the wind. Over on Insight Central it's said that each mirror delete is worth a 1.5% improvement in fuel economy, or about +1.1 MPG increase each at 72 MPG average driving, at speeds between 40 and 55 MPH. Noise is
slightly quieter around the mirror areas, so I know it helps.
It was a small 2 1/2" -ish diameter blind spot mirror that had been added to the stock mirrors by the original owner. Just retrofitted one on the driver's side. If I used the outside mirrors much I'd go with a more square one for better visibility and viewing angle, but I primarily use my panoramic rear view mirror, so the driver's mirror is primarily for legality.
In terms of a wife's opinion, I'm unmarried but I'd say the gains aren't worth her disapproval, unless you wow her with a panoramic rear view mirror first.
