The BMW M Power Meter iPhone app has a few distinct advantages over its competitors, not the least of which is that you can download it for free.
For 30 seconds of work, the M Power Meter tracks your vehicle’s speed, acceleration, travel time and other stats from your drive. Best of all, despite its BMW branding, it works with any vehicle, and all you have to do is take it along in the car and tap a single button.
However, we do not endorse driver distractions, so just don’t spend your entire drive staring at it while you speed.