Cars losing mileage

i have a 1991 mazda protege DX with the 1.8L SOHC engine
and all of a sudden im losing gas mileage fast i brought my car home last night and id only used like a 1/4 of a tank and this morning it was already halfway between the 1/4 mark and 1/2 mark and i filled up and i was only getting 25mpg when i usually was getting like 28 or 30
 
Back