Tow haul mode
I am sure this has been discussed before, but who uses it and how? I have a 1 ton diesel dually and will be towing a 5500 lb (dry) trailer. I am assuming it will lower fuel economy? Am I correct in as...
Forum Discussion
johndeerefarmer wrote:Not necessarily true - if the engine is not laboring and is producing the same power, the fuel usage will be the same.
Tow/haul holds each gear longer so you should use more fuel. In other words instead of shifting into 6th at 1800rpm it might do it at 2000rpm. Th higher the rpm, the more fuel is used. I leave it off unless the truck is frequently hunting gears or if I need it for engine braking.
In addition, the torque converter clutch locks up in the lower gears to save transmission oil temps. If there is less heat going into the trans fluid, then there may be a tad less fuel being used.
I have not noticed any fuel economy difference using T/H but I sure like the engine braking.
