I agree that the truck in the rendering would use a lot more than 500Wh/mile. I'm thinking of something similar in size to the F-650. The mileage of the F-650 was just a guess based on a quick search, but test data shows it (~15k+ lbs) with a 50% payload ($3k+lbs) varying from ~9.5mpg to ~12.5mpg @ 55mph depending on the engine.
https://www.nhtsa.gov/sites/nhtsa.do...chstudy-v2.pdf
Compared to your EV Ranger, I'm guessing a F-650 size Tesla truck would weigh maybe 2000lbs more, have half the drag coefficient, and much better efficiency. The Model 3's entire drivetrain is close to or the same as the efficiency of a 9" ADC, so that should be a big boost as well.
https://model3ownersclub.com/threads...-model-s.5252/
How are you getting 700Wh/mile at 20mpg in your F-250? At 20mpg, I'm getting 36.6(kWh/gallon)/20(miles/gallon) = 1830Wh/mile.