In '84 when mt dad bought a ford diesel and farm fuel was cheap I knew what was going too happen with diesel prices! 1 thing I wish I was wrong about! My '81 454 gets better milage than ant diesel dually loaded will do! I get 14mpg lugging 30k gcvw at 90mph (10mpg in strong wind). 390hp, turbo400 with 3.73 gears. Takes a bit too get rolling, but hauls butt from then on! $4.899 for diesel and 3.699 for unleaded.