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Re: locker in your diff?
If you corner with enough throttle to "lock" it , both tires will be turning at the same speed, which means that one of them binding on the pavement. This extra drag is what hurts fuel mileage. On tires it is most noteable on the right rear because right turns are tighter than left, causing your right tire spin on the pavement when it's turning at the same speed as the left, but traveling a shorter distance. I wouldn't run anything but a locker in my 4wd. You just need to adjust your driving habits to cut down on tire wear and other "quirks" associated with a locker.
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