So I go to the tire shop and check the pressure on all four. Had 32 and I put 8. U might think 40 is too high, but it rides great, better handling, better response, +1 mpg on city driving to an astonishing 16mpg(it sucks). This test was done on style 168 20" wheels

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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD