2017 VW Jetta with Low MPG

[LDB]

You don't divide the 289 miles by the 14.5 gallon capacity of the tank. You divide the 289 miles by however many gallons you put in when you refill the tank. If you bought say 13.73 gallons then you got 21.05mpg not 19.93. Still not good but a little better.

Is your car stick shift or automatic? What rpm are you shifting at? What is your tire pressure? Do you have extra stuff in the car? What speed do you usually drive? How quickly do you accelerate? All those things can affect your overall mpg.