DEF fluid tanks hold about 13 gal. Def fluid weighs more than diesel. Def fluid weighs about 9 Lbs per gallon.
Most truck operators who've bought engines whose exhausts are equipped with selective catalytic reduction after treatment systems say that fuel economy is at least as good as what manufacturers claim and in some cases is better.
What about the diesel exhaust fluid that's needed for this process? Spraying DEF into the exhaust to chemically neutralize oxides of nitrogen, or NOx, is the major action of the SCR used by almost all diesel builders. Like fuel, DEF is consumed in everyday running and should be accounted for in any economy reports or claims.
For over-the-road operations, manufacturers employing SCR predict DEF "dosing rates" of 2 to 3 percent. That means 2 to 3 gallons are consumed for every 100 gallons of diesel fuel, and 102-103 gallons of fluid should be factored into a mile-per-gallon calculation.
Any calculation, summary, description, or paraphrase of a regulatory requirement on this site is intended to provide general guidance only. Please consult the text of the Federal Motor Carrier Safety Regulations for a full account of the applicable requirements. All calculations should be confirmed and checked before using. Requirements and calculations can change as regulations change.
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