It does, but it also gives you greater sharpness and more consistency (since you use it once and discard it). You dilute just before use, and only as much as you need from the undiluted stock solution.
I didn't intend to use replenisher, so I won't be re-using the D-76. Actually, after reading the health warnings on the D76 packet, I ordered a packet of Xtol.
I will have to give the 1:1 a try later though, just to see the trade-off with increased sharpness vs. coarser grain.