My Freightliner S2RV chassis has a 10 gallon DEF tank and I get approx 250 miles per gallon of DEF with my Cummins ISB 6.7. I normally fill my DEF tank with the fuel fillip after the DEF gauge reads 1/2 tank. At that point it takes a little over 4 gallons of DEF.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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