Just to be 100%, OverDrive is the "D" with the "O" in the center.

Anyways, As I have read online, using OD for city, highway etc. is recommended but I should use "D" drive for towing.

I had the truck out today with the trailer with the bike on it and used it in "D" and when on the highway for the heck of it I put it into "OD" and the RPM's dropped a couple thousand and had no issues. Wondering if when on the highway at highway speeds if I should put into "OD" and use "D" when in city and hills. With the RPM difference would think I would be buring more gas when at highway speeds when in "D" drive.

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You're exactly right. Under 40-50 mph and on hills you wanna use drive. Over 40-50 and everything else you wanna use OD. I'm not sure about hauling though....

 

You should be using overdrive unless you find the transmission constantly down-shifting and up-shifting as you are keeping speed. To drop down into 3rd when under 40-50mph will only accomplish one thing, decreasing your fuel mileage.

 

I've never noticed overdrive really help in any of my rides till at least 40. I've always been told use drive around the neighborhoods and use od for cruisin. Somethin with the way it shifts.

 

Now I was told.... rather read online that OD should be used for in town and cruising and D should be used for towing and/or hills.

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Again, if you can hold your speed, even while towing, in OD, there is no reason to shift down to 3rd. It is a matter of heat buildup. Constant shifting produces heat. If the torque converter unlocks, it produces heat. You want the least amount of heat.