Well, y'all got me curious. I downloaded 2 apps for my phone that will both record stuff like 0-60. Torque Pro, and Drag Racer.
Drag Racer uses GPS to calculate your times.
I believe Torque Pro uses the inertial sensors in the phone to measure acceleration, to then calculate times.
Torque Pro will also interface to a Bluetooth OBD2 module, but I don't have one of those (yet - it's ordered).
I went out and played with them a little bit. The best time I recorded was 8.5 seconds 0-60. That was in Drag Racer, with:
Hemi w/eTorque
3.92
In 4WD High
Traction Control off
Start/Stop off
But, I'm not trusting any of it too much, yet. I thought the best was actually 6.5, but Drag Racer is currently showing a best of 8.5. But, it also didn't actually save any of my runs like I thought it was supposed to. So, maybe I did see a 6.5, but it didn't save it. It seems to want me to do a full "race" before it records things, and I'm not sure yet exactly what it thinks a full race is. 1/8 mile? 1/4 mile? Something else? I don't know.
I think the real test will be once I receive the OBDLink MX+ that I ordered today. That will log the vehicle's actual speed that is coming from the OBD data (both, actual speed and the speedometer-reported speed, which apparently can be different).
I'm not sure how much I really trust an app that relies on GPS data to calculate times. I don't know how fast (or accurate) the GPS in my phone (a Samsung Note 8) actually is.
One thing I AM pretty sure about. If a Ford 5.0 will run 0-60 in 6.something, then my Hemi will, too. So, I am pretty doubtful about that 8.5...