Forum Discussion

ejc1214's avatar
ejc1214
Explorer
Jul 28, 2013

Settle an argument for me, please!

My buddy and I have been arguing over this for a few weeks and I keep telling him that he is wrong about this. He says that I should not drive with the tow-haul on all the time because it hurts my MPGs and I am saying that it does not make a difference once at cruising speeds as if I take it out of tow-haul my rpms do not drop and stay steady at about 2400rpms at about 62mph. Even when I was towing with my Duramaxes I just put it on tow-haul mode and forgot it. I never saw a difference in MPGs. I just like the way it holds the gear a little longer getting going and the help it gives me with the grade breaking even on the highway.
So, who is right?
Class A
  • KD4UPL's avatar
    KD4UPL
    Explorer
    Jul 28, 2013
    IF it hurts MPG it would be so small as to be nearly undetectable.
    At cruising speed the torque converter would be locked whether in T/H or not. The RPMs would be the same. The shift points wouldn't matter because it's not shifting.
    When stopping, starting, accelerating, etc. T/H off may give the mentioned nearly undetectable increase but that's not the point. T/H mode is the proper mode according to the designer of the vehicle for the situation. It provides better acceleration/deceleration and less mechanical wear on the vehicle. I wouldn't sacrifice vehicle control and longevity for .1 MPG.

About Motorhome Group

38,705 PostsLatest Activity: Jan 26, 2025