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      02-17-2013, 03:29 AM   #9
BMW86
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Drives: CLA45 AMG Macan S
Join Date: Jul 2008
Location: Australia

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I think you need to factor in these variables:
- condition/wear of both sets of tyres
- the road you did the test on
- road surface temperature and conditions (ie. if it has been raining, for how long or how long ago etc)
- tyre pressure
- tyre temperature

From first hand experience these factors can have a noticeable effect