The truck now has 6000 miles on it. Filled up this morning and evic showed 20.3. Hand calc showed 19.90. All city miles, some freeway inter city. No towing. Each tank is creeping up as the engine is breaking in. I have consumed about 4 gallons of DEF in 6000 miles. It seems to regenerate about every 700-800 miles with my driving style. I have only towed light trailers and infrequently. My second gen with a stick would be getting about 20.3 hand calc in this same time of year under the same conditions. Couldn't be happier.