hey! if your o2 sensor is bad then just replacing that could probably get you that extra 2mpg and then some!
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2250 and 2500 rpm and it seems to run good in this rpm band . . .
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not too bad for your gearing. I don't know what my stock gearing is, but it allows me to run 1500 rpm at 55, 1750rpm at 60, and 2000rpm at 70. I went 40mph in first gear the other day (tried to see how fast I could go before it hit the 5k "redline") so I'm pretty sure that it can go faster than 100, but it's the drag that probably prevents it from doing so.
How would I test if I had a bad o2 sensor? I've contemplated on replacing it a few times just to see how much it actually helps. But I'm still having trouble finding funds to spend on the vehicle *sigh*. Good to see you trying though! most lifted people wouldn't dare try to get good FE.