I was considering the eco boost back in March 2011. I pull a 27 foot travel trailer from IL out west to the mountains about every other year and in the 4x4 6foot bed with a tow package model the ecoboost was not available - only the shorter bed. I read the reviews and the mpg back then was only a couple miles better. While the torque was higher in the 6 cylinder and many people were telling me it would be fine, I wanted the longer bed so I went with the 5.4 L V-8. It's pulled my trailer to Idaho, Wyoming, and the Smokies. I get 15 mpg average and 10 pulling my trailer. If you don't pull large trailers I'd say the Eco boost 6 would be fine if you want to get a couple more mpg.