If you are going to tow with the 2.7 order it with the payload package, which comes with 3.73's. 3.55's are plenty adequate for the 3.5, that's what it comes with when you order it with max tow.

 

While simple physics show that the 2.7 will be working harder than an engine near twice its size, that doesn't mean the 2.7 isn't perfectly good for 200,000 miles. I wouldn't worry about it unless you plan on performance upgrades. Sucks to spend a bunch for diminishing returns.

Regarding the GT. America's fastest cars are in a unique positon real world racing. Many of them are raced at less hp than available from the factory. In spite of Ford marketing, this gives clear explanation why Ford is running a turbo 6 in the GT vs the voodoo. Bump the GT to 1,000 hp and all you get is more weight added by the sanctioning body. More weight makes life very difficult for a wide range of reasons.

For a clear example look at the old GT. It was never road raced with the motor anywhere near its limit. If they did, they'd just add weight to slow it down. Same problem with the Vette.

 

I wouldn't want less than a 3.73 regardless of what I got. I prefer to have lower gearing, personally. Sadly the wife got a new Ram, so I am not getting anything for a long time. Hopefully my lil 4.6 can last that long.

 

3.55's are plenty good with a 3.5 Ecoboost and 10 speed transmission. It has a 4.69 1st gear. The 6 speed had a 4.17 and the 4 speed had a 2.84.

So - your effective low gear ratio with the 10 speed and 3.55 is 16.65, the 4 speed with 3.73 is 10.59. Huge difference right there. The Ecoboost also has more low end torque than most V8's.

 

I tend to go to a larger tire, so that is one reason I would want the lower gearing.

 

Follow-up question:

How well does the 2.7 EcoBoost do with towing? The maximum I may ever tow would be around 5,500-6,000 lbs. Any experience out there with 2.7 towing?

Thanks!

 

https://www.tfltruck.com/2015/02/201...-towing-video/

 

We have the 3.5L ecoboost and have been disappointed with the mileage. If you baby it on flat terrain and stay at 55mph then it will deliver impressive performance. I have gotten up to 24mpg in this circumstance. On the freeway at 65mph w/cruise control I get more like 19mpg. Where mileage goes south is when there are hills. Our local terrain is hilly and I am lucky to average 15mpg and that is with a very light touch on the gas pedal.

Last summer I had the camper on and was doing crew work on the Pacific Crest Trail. The camper is light, about 1200#. Powerwise you barely notice the load. Every day we would go from base camp, up the Cascades to Rainy Pass, then back down to the base camp. It's all 4 lane hwy, 55-60 mph driving. The trip was about 20 miles each way. My best mileage was around 12mpg, in spite of the return trip being all down hill. Another person had the 5.0 in his 2015 F150. He was pulling a 2500# trailer and consistently was seeing 17mpg. It seems like as soon as the turbos engage fuel mileage takes a nosedive. And it doesn't take much of a hill to make this happen. Are others experiencing this too?

 

Packing a 5.0 and loving it thus far.

 

What year?

 

I used to have a 2004 f150 with the 5.4, and was getting around 15 MPG. If I babied it, I would get around 16.5 on the highway. It had 340,000 miles on it when I traded it in, 330,000 of which were my miles. I opted for the 2.7 and love it! I have 15,000 miles currently, and here is what I have found...If I baby it, and try to time the stop lights, I can easily get over 21 MPG in the city! As for real world driving, I am regularly getting 19 city and around 21 highway. I have not towed much with it, but the little towing I have done, I can say that it affects gas mileage quote a bit, but there is enough power with plenty to spare. I personally am amazed at how much power this little gerbil has. note...3.73 gears.

 

For FirstOnRaceDay you asked about how the 2.7 tow.

I have a 2017 Scab with the 2.7 eco and 3.73 rear end. I tow my Autumn Ridge 266 rks no problem. Even going up hills is nothing for this engine. Give it a bit of gas , rpm go to around 3000 to 3500 and I have to backup on the gas to keep it within the speed limit. Same hill with my old 4.6, I had to put the pedal to the floor and would be revving around 4000 to 4500 and it was having a hard time keeping up its speed.