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Mmm I personally have to disagree. I don't think Froyo was the reason for the battery life. People are very quick to miss things they changed, apps they downloaded or removed, small settings they fiddle with here and there.
Just for an example, a week ago I switched on Geolocations in Beautiful Widgets, thinking oh now that I have an Extended Battery I can afford the little luxuries. Well guess what? My batter was TANKING significantly worse than it was even when I was on 2.1, unrooted, and with very few apps. "What gives?" I said. Well, after digging around, turns out that because of that one little setting, my phone wasn't sleeping. So even though I only used my display for less than 20 minutes, my phone was RUNNING for over 4 HOURS. That means quite a hefty toll on battery life.
So after changing this one little setting my battery life went back to what it used to be.
Now I'm not saying Froyo doesn't help battery life "at all," but I'm simply trying to get the point across that most likely, OP's enormous gains in battery life are not due to Froyo. Don't hate on me for saying this OP, it's just more likely than not something else that you are overlooking and the placebo affect is causing you to think well the only thing I changed was Froyo, so that must be it.