“Why not give people a more useful yard stick with which to compare vehicles
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1970 Cadillac Sedan Deville, 4 door, 500 cu. in., loaded pulling 6X12 tandem trailer packed full. 17 mpg at 70 mph.
Best mileage I have ever experienced.
I am guessing that you were long hauling on flat interstate highways.
But that was probably the best engine GM had ever made.
A friend of mine’s dad had an Eldorado with the 500 in it. Having that car burn rubber with the front wheels was quite a sight.
His dad was a little naive to let him borrow that car.