I've had several 3500 duallys, 03, 04. 5, 05, and a 08 (5500)... . all with the 4:10... . all are now gone except the 05 listed below with the NV5600... I've got the last 3 years of fuel receipts and this truck tows a 15,000 lb 5er 90% of the time and can't think of when I've gone through a full tank of fuel and not towed... Towing around the pacific northwest... OR, WA, MT, WY, UT, AZ, ID, CA and including the 10% grade at Grand Teton Pass... . 9. 54 MPG overall average over the past 3 years... my software that I use only goes back 3 years...
CarCare.com or CarCare.org... one of the two... track all my vehicles, and major equipment with fuel and repairs... great software.....