A new device with an associated app called Automatic links your iPhone to your car, and promises to save you money on gas, as well as call for help in an emergency. You plug Automatic's device into the ODP II port under your dashboard. Most cars in the US manufactured after 1996 have the port. Once you plugin the Automatic to your car, it links itself to the iPhone app and the possibilities begin.
Automatic will learn your driving habits and give you suggestions on how to save on fuel. For example, if the app notices you often accelerate too quickly it will recommend that you tone it down a bit. It will also alert you if you're speeding, or braking too hard too often. Their website says rough braking "abruptly decreases fuel efficiency and dramatically increases wear-and-tear on your car’s brake pads."
If you are involved in an accident Automatic will call 911 with your location, and can even alert your family via your iPhone.
One of the best features of Automatic is the push notification if your "check engine" or "emergency" light comes on in your car. You will be able to clear the code to turn the light off which might save you a trip to the mechanic.
Automatic will sell for $70 and you can pre-order it at the link below.