Owners on Ford truck enthusiasts message boards claim their 1982 to 1988 6.9-liter engines get 12 to 17 mpg in combined everyday driving and up to 21 mpg on the highway. The 6.9's 7.3-liter ...

The first Power Stroke stayed in the lineup for more than a decade and gave way to a 7.3-liter replacement ... While early 6.7-liter Power Stroke engines can get up to 20 mpg when driven gently ...

Ford 7.3-liter Power Stroke Common Problems As ... on the F-350 4x4 Crew Cab DRW with the 6.7-liter HO diesel engine. Fuel economy numbers are not required for vehicles over 8,500 pounds, but ...