Originally Posted by wwsmith111
What does tow haul mode do? All that my Tundra seems to do is shift at a higher rpm and it ruins my gas mileage.
Reason for the higher shift points is that's where your power band is. Gas engines have their power and torque at the top of their RPM range, whereas diesel engines have theirs very low. It also holds gears longer so the transmission is not shifting so much. Tow/Haul also locks out your overdrive gear; towing in OD can burn up a tranny in a hurry, and it has very little torque so it's not mean to be used with any kind of load.
Some of these things are always happening while towing, some are only happening sometimes. I tried clicking my tow/haul mode off and on at different times last time we were out, and at some points I didn't really notice much difference because my transmission usually won't go into OD while towing whether I allow it to or not.
2014 Jay Flight 28 BHBE
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