Probably going to buy 2013 F150 Crew Cab 4x4 w Ecoboost. Dealership has 2 that are priced about the same, but the one with more options only has 3:31 axle ratio......Other one with less options has 3...
Even the 3:55 is somewhat of an economy gear. With the EB it is no doubt capable of towing using an economy gear if you can justify it by your use. If the truck spends 95% of it's time driving to and from work then go with the economy gear (either one) but the higher your ratio the less fun towing will be. You'll notice the difference most in mountainous terrain. Good luck / Skip