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if you are doing highway driving a taller tire wheel combination will lower the rpms at cruise. That's the name of the game. dont go overboard. your looking to increase the diameter by 3-7%. Tirerack dot com can give you alot for specs on tires. Also remember that there is a wieght issue. (previuos posts) each puond over factory is 4 times when it is rolling. so there is more wear on the brakes etc. of course your driving easy.
And the higher psi is a less forgiving ride.
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