Yep, olde modest, long-running small diesel, likely just mech-inj back far enough... not the 1000 ft# of Tq that everyone "Needs" to have today, but Those mpg's !!!!!!Boss was just shy of 6’7” and didn’t factor the comfort of a full size truck for his stature so I often made deliveries with the diesel… we did one comparison and he said easily 4 times the miles per gallon…
Buddy used to tow his son's motocross bikes to the Carolina's, for training camps. Used an old Econoline with the IDI diesel..... his friends up here, towing with modern diesel P/U's to the same areas, just about puked when they saw how little fuel he used. ( Progress ?).
For general running-around (not towing a tri-axle), approx 3L TDzl would be of interest.... few options, in Kanada today....
Rgds, D.