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with newer vehicles especially AWD or Auto Four-wheel drive it is very necessary to have the tires rotated/balanced and replaced to maintain similar size all around.
with the new Auto 4wd systems, if a vehicle has worn tires on the front and new tires on the rear the tires are moving at different speeds simulating tire slip which will tell the computer to apply power at the front wheels, this will obviously disrupt ride comfort and cause handle problems vibrations and unneeded wear and tear on drivetrain components.