Keep track of your car’s average mileage to see if it really compares to the advertisements.Note:When you first open Car Tracker, you have to set your default preferences for units. If you don’t, for some reason, then many of the features will not work.Also, try to add your car to the list when you fill up so tracking will be easier (unless you want to estimate how much gas you’ve used). I say this because, for now, it calculates how many miles you’ve driven based off the odometer reading on your car. I will change this later.