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The accelerometers in phones are not that accurate.
I have a GTech Pro which I've had for years and is usually within two tenths and 2mph of track times.
I can get below 4.7 sec for 0-60 all day with BMS Stg 1. I think I could run a 13 flat a the track, hoping to get way into the 12s with the Stg 2 beta.
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2006 E90 330i (retired)
2009 E90 335i (retired)
2012 E70 X5 50i M Sport (retired)
2016 F10 535i M Sport
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