To get that low a mileage you must be driving very short trips when it is very cold outside. Or you are warming the engine before you are driving and using the defroster all the time.
Is the engine shuting off when you come to a stop?

As above we need you your location, trip length, city or highway etc.

Ducit Amour Hybridae
Mark Smith
Master Certifited Technician
Tempus non reparabilis fugit
"It isn't pollution that's harming the environment. It's the impurities in our air and water that are doing it."

Best Tank 35.0 MPG