[wdfifteen]

Originally Posted by motion

Thanks. So, all things being equal, will more gears result in better mpg while towing?

Reason I ask is because I would hate to fork out $40K plus for a new F150 with a 5.0 and end up with 9mpg while towing my small trailer.

How small is "small?" Is it a box or a flatbed?

In general more gears give you more options to match ground speed with the engine's most efficient RPM, so yes it gets better mileage. The more your terrain and load vary, the more difference there would be between a 6 speed and a 4 speed.