Please don't shoot the messenger. If a diesel is driven like a gasser the mileage will stink empty or loaded! The long pedal is a fuel dispenser. If it will go up the hill at 50 mph at 1/4 throttle it will burn a set amount of fuel. If you go up that same hill at 50 mph at full throttle then you burn a lot more fuel. With gassers the throttle plate let's more air in then mixes the fuel based on air volume. With diesels it uses the pedal position to ration the fuel. At no throttle it burns a set amount of diesel whether you are stopped or coming down the hill at 100 mph with your 18K lb trailer hooked up. Also no load no heat so if it gets hot pull over and take load off so it can cool down. Let it idle so the waterpump can circulate the coolant through that heavy engine and turbocharger. Now you are worthy to sit at the big rig table with the big boys!!
