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gears are a way better bang for the buck and will not mess up mileage, that is jsut an old wives tale. most people will see the same or in some cases even slightly better highway mileage. your mileage around town will change if you like messing around, but that is up to how you drive more than the gears.
i would also suggest looking for a better shop to do the gears, 900 bones to put in 3.73's(you shoudl do 4.10's) is crazy
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