Walmart has it for $10.85My 2014 Grand Cherokee DEF tank was 1/2 full when I picked it up. Not sure the dealer even knew to check. I have 4000 miles now and I am guessing I getting 1000 to 1200 miles out of a gallon of DEF. That fits the 10,000 mile scenario out of a full tank fairly well. I am using the Peak Blue DEF from the parts store. Like the other post it is $15.00 per 2.5 gallons.