Eh I wouldn't worry bout it. Your dollar is welcomed the same as theirs. Get in, fill up, get out. Easy.
Same token tho, if all lanes are packed I wouldn't wait unless I was in a no-restart situation but that's never gonna happen.
Just for reference, filled up the DEF this am at a Pilot station. In 7600 miles I used a lil over 5 gallons. At the pump I spent less than $15 @ $2.79 gal. When I went inside to pay, the 2.5 gal boxes on the shelf were $15.69. No brainer.
As long as it's within the shelf life, yes. But IMO your best bet is to fill up in bulk at a truck stop. Half the price or better and you know it's fresh.
I plan on it. I think the messiest thing will be having a big enough container. Might fab up something with splash guards because I've seen where there's a lot force behind those 11 quarts lol.
Making another unloaded 500mile+ run across the Apps to the coast from Ohio Wednesday night. Will report mileage. Kind of anxious to see it, as I feel these last 2 tanks have calc'd out a bit lower then I've been used to.