Building a Ford F-150-HD payload?

Groover wrote:
If you can get 18.5mpg out of the 6.2 that is very impressive, especially on an F250. It was only rated for 16mpg highway when it was offered in the F150 and that was a lot lighter truck. http://www.fueleconomy.gov/feg/PowerSearch.do?action=noform&path=1&year1=2014&year2=2014&make=Ford&model=F150%20Pickup%204WD&srchtyp=ymm

And yes, you should have gotten the tailgate step and the factory bed liner.

For reference my 2016 F150 crewcab with 6.5' bed and very loaded weighs 5,600lbs with bedliner, bed steps, sunroof and FX4 package. So nearly 2,000lbs lighter with more equipment. The only thing that it does not have is power steps.

You probably do have a quite a bit of wiggle room on the weight capacity. I used to run my 1991 F250 regularly with the rear axle loaded to tire capacity(about 3,500lbs). I never broke anything but I did get in the habit of downshifting every time I applied the brakes.

I think you misunderstood something along the way. I have the 6.7 Diesel, not the 6.2 Gas. As part of the added curb weight, there is a reason DW calls it the 800 pound Chihuahua under the hood. The diesel option adds 800 to the curb weight. Making the diesel engine in Chihuahua MX, that just ain't right.