The classic inline 6-cylinder engine has a fuel consumption of approximately 12-15 L/100km under normal driving conditions. For buyers considering the Chevrolet 3100, that matters because it affects how easy the car is to live with, whether for commuting, family use, long-distance driving or ownership costs. The useful way to read this is not as an isolated specification, but as a clue to how the car will feel in real daily use.