I bought a 2012 Ford F350, FX4, dully, 6.7. I pull a 24' Enclosed trailer that has two Exmark Lazer Z and a Bad Boy in it and i am getting 14 mpg. I had a 2009 F350 that was getting around 8, but that was a 6.4. When i am not pulling this trailer i am getting 19 mpg. Ford with the new 6.7 is the way to go.
2012 Ford F350, FX4
2012 Bad Boy Outlaw XP 61"
2010 Exmark New Lazer Z (junk) 60"
2009 Exmark Lazer Z 60"
2008 Horton Hauler 24' Enclosed Trailer
All Red Max Blowers, Weed Eaters and Edgers