Nissan,My car is Nissan Premiere and it uses Elecetric Carbueretor but I notice anytime I buy fuel it burn faster, I mean the fuel use to

My car is Nissan Premiere and it uses Electric Carbueretor but I notice anytime I buy fuel it burn faster, I mean the fuel use to get exhausted on time. Please what would have been the cause?
My car has an automatic transmission.