The 2018 Chevrolet Colorado has an EPA-estimated fuel economy of up to 20 mpg city/26 mpg highway for the 2.5L 4-cylinder engine, 18 mpg city/25 mpg highway for the 3.6L V6 engine, and 20 mpg city/30 mpg highway for the 2.8L Duramax turbo-diesel engine.