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Having 30s (most measure around 29.5" or so) on an XJ isn't going to make much of a difference over the stock 28s or 29s in terms of mpg. Do a little aero modding around the wheel wells, and on the highway, the taller effective gearing may even help. In city traffic, however, the extra rotating weight will hurt.
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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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