Have you ever bough gas for a 500 ci or larger gas engine pulling a heavy load.
EPA was trying to design, or regulate diesels out of existence.
They would have liked to see one or two gas engines, on the road, no matter the cost, or lack or acceptabiltiy, reliabiltiy and so on.
Still Sonnies makes a gas eninge, all aluminum in the next generation chevy hemi design, or mopar or ford hemi of over 900 ci and a 1000 ci is in the works.
Or a WWII Ford all aluminum V12, 4 cam hemi, for a tank.
You could pull right along side the 550 t0 800 ci diesels.
You might get 1 mile to the gallon.
