Should've kept the diesel - 2014 Ecoboost

[Jake]

So this exposes a problem that was only recently rectified. Tow ratings on trucks have never been "standardized" - it's been up to the manufacturer to just say what they feel is adequate and then people buy/use their trucks, exposing the weaknesses as you did, Ryan.

The Society of Automotive Engineers (SAE) came up with a standardized test and Toyota was the first to adopt it in 2013. Ford adopted it for the 2015 F-150 redesign, so your 2013 has the yolo rating.

Jalopnik wrote a good summary of how the SAE test is modeled: https://jalopnik.com/what-is-sae-j2807-w...1593305929

So yeah, pre-2015 F-150s are rated to pull whatever weight, but not necessarily at 80% throttle with the AC cranked going up a mountain pass for 10 miles in 110° heat over and over and over for 4 hours. Slowing down a little is the easiest way to fix the issue.

70ish mph is fine for towing, assuming your tires are properly inflated and rated for the speed.