My 450 ISL Cummins uses a gallon of DEF in 400 miles. My 15 gallon tank would take me 6,000 miles full to empty. I will add or top it off at 4,000 miles. Sometimes I carry an empty jug along and fill it when I top off the tank. We run about 10,000 miles a year, so it's never very old.
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2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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