CM871 fuel mileage

[Lead_sled]

My fuel mileage sucks, but for other reasons. I drive 40-60 mile routes with slowing down and speeding up in small towns. Also, red lights and rolling hills. The truck also idles when waiting to be loaded and unloaded. On top of that, truck idles for my 8 hr resets. The trailer I pull is just a chassis, but the box that goes on it is like a wind sail. It sits about 15-20’ behind the cab. I still manage to get an average of 4.5 mpg.