I have an app on my phone called Dash Command. It connects over Bluetooth to a dongle I have plugged into the odb port on my truck. It gives a lot of information to the user using the information provided by the trucks computer. The mpg it calculates is pretty close to hand calculations, that's more accurate than the numbers on the dash using the same info. You want info on how the engine is running? It can help with that. You want 0-60 or 1/4 Mike times? It can do that. It's a fun tool to have.