Drive smarter with Petrolr. Keep track of your fuel efficiency, driving routes and habits. Use Petrolr to turn your car into a connected car! Petrolr doesn't need any extra hardware to work -- NO OBD REQUIRED. Just your phone. We've used millions of lines of telemetry to build a computer model of vehicle performance. Applying that model to the data from your phone's GPS and accelerometer sensors allows Petrolr to estimate your vehicle's fuel economy(MPG) and performance characteristics.
Continued use of GPS running in the background can dramatically decrease battery life.