Ram owners. What gear while towing on highway?

That 3:42 helped give me an average of 22.5 mpg on an unloaded trip to Florida and back running 70-80 mph too.

On only one trip I've locked out 6th and that was I-40 into Tennessee. As, said the shifts are a little late sometimes and I can set the cruise easier. Even with my lite trailer.

On a side note. The first new Ram I looked at and noticed the 3:42 on the sticker I asked the salesman about it. He said it must have been a special order, he's never seen one come in geared like that. :S