Well, I'm not trying to save money, I'm trying to avoid inconsistency. This is how it goes at my place. I mix up my D76, then put it into 16 oz brown plastic bottles from Freestyle, filled up to the very top. Works fine for a week or three (always used full strength), then there's a falling off that is just not easy to compensate for. I have some that is 5 weeks old and the negs I developed yesterday were underdeveloped. Maybe it doesn't store well due to higher temps in the home here in Fl. Either the plastic bottles that I'm using need to be replaced w/ glass bottles, or, as has been suggested, I should mix it up from scratch and leave out the suspect chemical. D76 does exactly what I want it to do when it works right, and I'm hesitant to go to something different. Sometimes I use the whole gallon up within a few weeks, sometimes I go a few weeks and don't shoot more than a roll or two. I'm not going to mix up a whole gallon of developer to develop two rolls of film.
The other option is to save up my rolls and develop them at once, but in the past this just created more problems. Sometimes a camera may develop a light leak or other issue, and I don't want to shoot several rolls only to discover this after the fact. What I find enjoyable is developing my film right away, as soon as it's exposed, because everything is still fresh in my mind from shooting.
I'd better learn to mix it up from scratch. You never know till you try, but my gut instinct tells me that HC-110 will end up close, but not the same. D76 is a great developer, I just need to find a way to get it to work well over a reasonable time period. Thank you for the advice on the hydroquinone Bob. That sounds like the fix.