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6.7L diesel, 6R140 6 speed auto trans, 3.55 gears and 275/65/20 tires. Crew cab, long bed F350 SRW. I see between 18 and 20 empty. I average 17 in the Summer and 15.5 in the Winter. With a 6' x 12' utility trailer hauling a 900 lb golf cart mileage drops to 14-14.5 mpg. The truck pulls like a freight train, but it likes it's fuel when under a load.
The 2006 was a 6.0 with 3.73 gears and the 5R110 auto trans. Everything else about the two trucks was equal. The 6.0 would get 22 mpg on the highway, 17 around town and 13 towing an 8500 lb fifth wheel trailer at any speed I desired. For what it's worth, I always tend to get a little better fuel mileage than average in every vehicle I have ever driven. This 6.7 baffles me and I have even considered tuning it to see if it does any better.
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