My 2007 F250 V-10 with 4:10's get around 8 maybe 8.25mpg towing my 8x16 enclosed trailer.. They say the taller gears help but the v-10 is a thirsty engine, though it is a very sound engine.
J&R Lawn and Landscaping
27 years old, Fully licensed and insured. 50+ accounts
Contents of Company for sale! PM for info!