 They didn't have an option for 3.5L Ecoboost FX4.I just got done towing a 28ft 8,000lb trailer to Yosemite National Park and it pulled it with no issues, turbo lag or trouble getting up 7%+ grade hills.I had a 2010 with the 5.4ltr v8 and it had trouble pulling the travel trailer even with the 3.73gears.In towing I got average of 12.5mpg. I usually get 15.5 in city and upper teens for hwy but I work in a hilly area so I'm getting better then I expected.I was a little worried about the Ecoboost reviews from the '11 & '12' models but looks like they worked out the kinks for '13 but I leased the truck just in case.If you need a truck that can tow alot & get v6 mpg's, this is the truck!