why do some smaller engines have lower gas mileage than some larger engines?

Question

why do some smaller engines have lower gas mileage than some larger engines?

In: 208

Answer 1

Nowadays the size of an engine does not directly correspond to its efficiency. With modern engineering a small 3-cylinder can have more power compared to an old 4 cylinder one. Tighter tolerances, different means of getting the fuel-air mixture, different fuel, different gearing, all contribute to where the optimum working point lies of that particular engine. It will perform most efficient when it’s working on that optimum.