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My Jeep didn't really do much mpg wise (within measuring error) when I stepped up from 225/70R16 to 245/70R16 tires (yes, I corrected the speedo). It dropped me from about 1825 rpm at 60mph to about 1760 rpm at 60mph. It definitely didn't hurt though.
However, keep in mind, with a 360 in the Jeep, it's still very over-geared, and will climb 7% grades (with 2 people and a couple hundred pounds of crap in it) at 60 with the cruise set without a downshift.
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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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