Seeing as how the teeming masses are hungry for data-
any data...
Got about 34 mpg on E66 over the course of 272 miles. That would be a good number for that trip on E10. Yeah, it's only one data point, and not a super precise one at that. No claims about the efficacy of this mod will be made at this time.
Removed 35lbs of stuff. Since I don't drive every day, any ride and handling response changes from the weight loss aren't noticeable to me; there might be a difference but it would be very subtle. Then again, the car was loaded to the gills and it was dragging butt. That couldn't have been good for aero and r.r. so that makes the 34mpg even nicer.
Am used to the Armstrong steering already. It doesn't take long to adapt.
No glitches at all related to the accessory drive rework: battery charges, lights and everything still work, alternator hasn't gotten hot, engine hasn't either.
I note that right after starting it at night, the headlights dim a bit between shifts/when it falls to idle, until the battery charges up again after a bit of driving.