850 miles/gallon of DEF
I’ve measured and kept track of my DEF usage for 45,000 miles. It varies between 750 and 900 mpg. In summer, at 64 mph, on level ground, pulling a small car, it stays pretty consistent at 850 mpg. I have a ScanGauge with an Xgauge set to read remaining DEF. It displays to 1% increments and appears to be nearly that accurate.
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