I wouldn't say a full mph. After tracking for a couple weeks now, with a more accurate GPS measurement, my avg speed went from the high 17s to the low 18s, so more realistically, about .5 mph improvement. Still, not too bad.

The Jones bars take a bit of tweaking to get them just right, but I'm getting close. Stem length increased by 10 mm, and the bars are a little more level. Small adjustments make a big difference. Accessory placement take a bit of trial and error.