His truck isnt some magic carpet getting 21 mpg. When someone asks what MPG people are getting, they aren't asking whats the best can be done for some short term situation if driven gingerly, they are asking for everyday real world experience during truck ownership. That dyno, along with the process parameters, is very much statistically representative. In fact, it's been dead center of people that aren't bullshitting about a comical 21mpg claim with this truck. So yea, when people ask what the efficiency is, they are asking for a statement that is as accurate as possible, and if you're gonna claim some number thats ludicrous, then yea, pull out the contemporaneous evidence as proof or called out as comic relief.Yes you are quite capable and you have repeatedly done so many many times on this forum.
Nobody, when asked, what their MPG is says " let me get me log book out to see what my running talley to date is" they simply just tell you, correctly, what their last tank MPG was.
The EPA uses a dyno machine to test vehilcle mpg and a dyno machine is not real world driving no matter what the data imputes are.
You sound like a MAGA trumper pathetically defending that poor woman ICE murdered yesterday... Oh... That's right... you are. Go pound salt.