DEF CONSUMPTION

If going on a long trip, I keep a blue DEF Walmart box in the bed of my truck as a spare. I've used it a couple of times while on the road when my warning light goes off. As stated, easy to buy, store and pour.

Thanks guys,I guess 5 opinions outweigh 2 bad ones.New DENALI in the garage.

~1000 mile per gal of DEF is also about my experience. It's a nonissue. I've bought at truckstop (easiest and cheapest) as well as paid ~$5 per gal at auto store when warning came on. In general I think about adding every few months, or just before a long trip, but it hasn't been a big deal if I've forgotten as you get a warning at somewhere less than 1000mi distance remaining.

You will use so little of it it kinda makes little difference what it cost .
With 11,000 miles I have spent less that 37 dollars . As far as age goes , if you have to worry about that , then maybe you ain't using your truck enough . Least months that I have seen on my purchase was thirteen months .
It ain't difficult to pour it in your self , we got no vending truck stop closer that 42 miles .

It depends on how hard the truck works. It uses more the higher the exhausts gas temp.

Cheapest and most fresh DEF will be by Truck pumps at Truck stops.

You'd get better responses in the Tow Vehicle section. Maybe the mods can move it.

1000 mi to the gal is average, buy it anywhere close that has it such as Napa auto, Walmart etc.