^^^^...yes Grit has it and add that they didn't have the gearing available as does everything today
Approx 410 ft/lbs at about 1,300 RPM. Flat till about 3,200 RPM and drops off a cliff at about 3.6K RPM
Too high a 1st (low numeric), nor double OD
They have the torque and torque curve to get higher MPG with a double OD
My 7.4L big block with 4.1's used to get 12.X MPG on the highway and occasionally (often enough to claim it) got 15MPG. Not empty, but with the volleyball tournament team going from the SF Bayarea to Vegas (8 folks, from my 6'4" guy to the 4'10" gal...8 gym bags, team bag, ball bag, 2-3 ice chests, etc...includes my ~200 lb toolbox)
Beat the snot out if it and am down to a consistent 10MPG
{edit} The 8.1L has about 40 ft/lbs more than my 7.4L and red lines over 4k RPMs, while my 7.4L red lines around 3.8K RPMs