honda accord gas?
 

i am planning on buying a car, a honda accord or honda civic, it is a honda accord 2003 4 cylinders with a 2.4 L engine, and the other is a honda civic 4 cylinders with a 1.7 L engine. My question is that how much more gas mileage will the civic do compared to the 2.4 L engine, or is it the same..?