Mileage Cost helps you keep track of fuel costs. To get started, swipe left and click on "Cars" -> "Add a new car". Swipe back to the main page and fill in your current mileage before saving.Whenever you stop to fill up, update the app with your new mileage, the price you paid for gas, and the quantity you just purchased. Later, click the archive (top right) to get detailed reviews of all gas purchases.