what causes my car to burn up gas so fast? on 1999 Hyundai Sonata

it also has a low shortage of power which prevents windows from opening or clock in car to stay on.this vehicle uses up gas up to 3-4 times a week to refill tank

Asked by for the 1999 Hyundai Sonata
Whens the last time you changed your spark plugs?
about 16 months ago