[Piotrsko]

Torque app is getting data from more or less uncalibrated sensors, not that it matters. They may or may not be calibrated to the cars onboard Computer through normal useage, but you will be unaware what exactly that calibration is and it would be kinda recorded somewhere in car computer speak in car memory. I suspect it isn't a hard data point but a relationship. Only thing you can do is get many manual readings and build your own highly accurate calibration table which you are in the process of doing.

Your coasting test is giving actual good data, although is is vague. Method of scanning either by bluetooth or torque app will give you the same data it's just a different access much like hardwire telephone and cell phone will both recieve phone calls.

<rant off>