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And more importantly remember there si a shelf life of about 1 year for DEF. I was on a trip from Florida to Michigan and got low. Looked at the spare bottle I had and it was over 1 1/2 years old. In Florida heat in rear of truck under a black cover. Threw it away and now wait until I'm at 1/4 tank then add 2 1/2 gallons. In my Ram not towing I get at least 1 year until I need to refil again. Like others have said towing, even a 8x12 covered 2 axle utility trailer usage is much higher let alone my 5er.
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