The only thing depending on year would be the bigger tires would might affect MPG a little bit, 31x10.5's on my '98 seemed to net a little worse then my '01 did for mpg, then again changes in the ecu occured over that timespan too. But if it were anything dramatic it (should be) listed @ fueleconomy.gov as a different model. But the diff/susp/etc. shouldn't really amount to any noticeable mileage change.
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