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As far as O2s, the front ones affect mpg, as they control fuel mix. The rear ones are only there to make sure the cats are working. Take a look at your exhaust, and figure out which ones are before the first cats (probably 2, if you have 4 total). Those are the ones to replace. Unless you get a CEL for one of the rear ones, or one of your cats, being bad, the others can be left as-is.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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