I have not used the app you did but I have several others including Torque but they are very unreliable in my experience and times are all over the place. It does depend on phone and the app as well I guess depending on how precise sensors are and how powerful hardware is a and how often it can take data samples from sensors. There are several data inputs possible: OBD speed, GPS speed and accelerometer data, then you need to take sampling rate into account as well. My D2 S8 0-60mph times could range from 5-8s in the apps.
If you have VCDS you can measure it more reliably with VCDS but you might want to compare VCDS and GPS speeds first. On D2 VCDS sampling rate is slow on K line so not very precise but a bit better, I was getting 6-7s, but on D3 it should be much better with a faster sampling rate on CAN
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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