I encountered 30s mpg in a ford six diesel, crew cab, jacked up stiff tread... and that was in 1992...and that freakin thing loved 85 mph.
It is part of my doings today, remembering that truck. If gas engines is going to be a hog no matter what.. something is wrong.
It is my reason for my quest of 3 main boxers..witnessing that truck on a 300 mile journey.
I got nearly 3000 pounds, 92mph contently on a low pressure 1781cc with an AWD. It is my best answer. And ya know... nothing is gonna beat it. Much like a diesel.
That truck was no joke.