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Not to rain on your parade but a battery that does not hold a charge, if it's not too bad will recover somewhat just from use. I think the hardended crystals become dislodged and sink from repeated cycles. The desulfator may work but I wouldn't take your situation as proof. I still haven't see any scientific tests anywhere. The only way to really kow is to have two equally bad batteries with the exact same history desulfate and exercise one and just exercise the other. I suppose there may be some other variables to control for but you get my point.
But as I said before. It doesn't hurt to try and !'m happy your battery has come back.
I tried the desulfation setting on my charger several times with my old t-105s but they didn't seem to respond. I then just decided to use them as-is and they have recovered quite a bit. All just anecdotal though. Maybe the desuf got them started.
p.s. Just did a highway70mph/city run and got a little over 33mpg EPA hwy:20. It was a dirty run with all kinds of weird traffic so I think I can do much better.
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