2008 Ford F-350 Super Duty XL 4dr SuperCab SB (5.4L 8cyl 6M)
I have 08 F-350 Super Duty DRW with 6.4 Power Stroke and 4.10 rear end. Drove truck on 2200 mile trip towing a 6500 LB. boat with a 600 LB. quad in the bed. Avg. mpg was 13.2 for the trip. Mixture of mountain towing and flat lands. Truck performed exceptionally well...great power and brakes. Now that I'm back with 5000 miles on truck I have seen 17 mpg empty. Truck is breaking in well and mpg is climbing. This truck is the best tow vehicle I've ever driven. It has the guts to pull hard on 6% grades with no sweat.
Cab. 6.4 Power Stroke diesel. Great sound system. Rides like a car.
20mpg would be great...don't think we'll see that! Also cannot get 4th gear on shift column...only 3rd. Only way to fourth is with down shift from accelerator.