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Interesting option if they could adapt a new petrol-specific head to a heavy duty 3.0L I-4.
A modern gasoline engine can make about 80 lb-ft of torque per liter, so a 3.0L could be in 240 lb-ft range without turbo.
Also, at only 60 HP per liter tuned for commercial/truck use, biased for low-end power, a 3.0L I-4 could put out 180 HP, equivalent to smaller van diesels.
Sounds crazy on the surface, but if Ford just designed a 7.3L pushrod V8 for trucks that may have GCWR close to 30,000 pounds, then a heavy duty 3.0L gasser may perform well and deliver fairly good economy with lower maintenance.