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Ideally you would want to conduct the test with the measuring device attached to the rear bumper rather than trying to hold it while trying to drive. Each time you pull the wheel to correct off coarse you add drag to the vehicle and affect the test results. I located a yourg man on you tube screen name=(landongendur)= that did some test with his metro. He took the mirrors off tested. He took the regular tires off and used 4 spare tires test vs regular. He ran vehicle with hatch back open test vs closed. He did speed test you name it if he thought of it he posted the results on youtube.
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