Install an EGT and run the absolute lowest temp posable to maintain speed . In my antique(no computer) 91 .5 Cummins I have to run agenst the governor x92.5mph for an hour and then idle it for 3hours to drop my milage in to your naborhood . If Whats broken ?
You have a technology advantage. You should be were my cap puts me . 24+
Adjust your valve lash . Inspect evry thing u-jounts diff, trans , mounts ,brakes . Ect ,ect.
Fill in your garage ...we can help more if we are informed.
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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