[Number 4]

Tow/Haul mode delays shift points by allowing higher revving between gears and then your tranny isn't switching back and forth to find enough power (my old 1999 Dodge RAM 5.9 liter drove me crazy with that). In my truck that mode also responds to the amount of braking power when going downhill. I came down some steep grades recently and it held right at 55 mph without touching the brakes. In the old Dodge I put the automatic tranny in "2" and feathered the brakes all the time or it would just run away. I'm loving that Tow/Haul feature!