Originally Posted by huntindog

I have heard your theory before. I have actually considered it, as it makes some sense when reading the test reports. You may very well be right on that. BUT It is only a 35# TQ difference. That could explain why in the words of one test, the ford was able to occasionally slowly pull away from the GM..Probably about 25% of the time. OTOH the TQ multiplication in gears 1-2 is thousands of pounds different. Even if one uses a derated TQ number to do the math in those gears, then it is stiil a huge difference.
And as I pointed out before,,,since both trannys have the same amount of gears (six) then gearing lower for power in the 1-2 gears will mean that it will lack performance at other road speeds. This shows up big time in the exhaust brake performance. The GM is able to enagage 2nd gear at a higher speed that the Ford which is in 3rd. So at higher speeds the GMs EB has a big advantage over the Ford.

At any rate, I have no way of proving or disproving the theory of the fords not maintaining rated power..The gearing advantage in the 1-2 gears though is easily proved by simple math calculations.

It is very possible that both theories are correct.

Originally Posted by cummins cowboy

you might be right about the ecoboost, if you couple the weight savings of the f150 what is that truck like 1500#'s lighter??

keep in mind this 6.7 was an all new motor and tranny. if you were ford you wouldn't wanna unleash the full potential right out of the gates. this way they have a setup that gets the load moving really well, puts out competitive numbers in comparison to the competition but yet doesn't risk prolonged stress on the engine and trans. maybe subsequent years will see them unleash this combo more.

Originally Posted by Shelby-GT-500

The Ecoboost was all new for 2011 as well. They did not hold it back. I also got about 9 mpg towing with the 150, the same as the 250 diesel. This 6.7 should get better mpg towing than a gas motor. I was hopping to get 11-13 towing an 8,000 lb trailer with the new motor. If ford is detuning these things electronically it would make sense that the mpg would drop as well.

As you suggested ford seems to have built reserve power into the motor this time. Evidence of that is they already bumped the power from 735 ft lb of tq to 800 to beat the Dmax.

Thanks

Originally Posted by cummins cowboy

11-13 is what I am seeing towing a similar load as you are. I have never seen 9 mpg ever in any towing situation save for pulling a large grade. I do think the ecoboost is on the ragged edge for durability, I think if you work one really hard its going to blow at around 100k miles, thats just too much power to push through a v6 engine. also the ecoboost hasn't been nearly as reliable and problem free as the 6.7. despite that if I could get by with a half ton I would consider an ecoboost likely at the top of the list.