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The worst I can remember calculating was around 15 mpg with my 2000 f250 powerstroke diesel 6spd 4x4. It wasn't broken in yet. My 89 dakota 4x4 wasn't much better with it's 3.9L auto with 250k miles. I think mid 40s mpg is the lowest I've seen in the metro and that was just after getting it running and before learning ecomod techniques.
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Best tank= 81.23 mpg on 07-01-2008
Longest range= 791 miles on 9.74 gallons
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