Sounds like my dad's '72 Travelall 4x4 with the 345. it got 7 mpg. City driving; 65 mph highway driving; pulling a '69 Chrysler 300 demolition derby car on a tandem-dual trailer for 200 miles at WOT: 7 mpg... 
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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