Angelo, just leave the tow/haul mode alone. You do not really need it for towing a vehicle. My PT Cruiser weighs 3200 lbs. , and I tow in regular mode all the time. Let the tranny shift when it wants to. It is computer-controlled, and senses loads, speed, and it learns your driving habits. I DO use the tow/haul mode for hill descents, as it enables engine compression to keep speed down without taxing them brakes. You can enable tow/haul when ascending steep hills to keep the engine in the high rev range, 3500-4500 rpm, if you wish, but it really is not necessary. The V-10 has enough torque to pull hills without much fuss. Gas mileage will not be impacted much towing a toad. I get 9-10 mpg., towing my toad. Not much better without towing it. Check the Ford owners manual if you want correct info on the tow/haul feature. I find this feature very helpful for mountain descents.
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