Def at pump
Laughing Gas
Joined: Aug 2017
Posts: 802
Likes: 197
From: Tupelo, MS
Sorry but the math is correct. Def in a container is actually about $8+ a gallon. However, the calculation on usage is absolutely correct as stated. Not sure why any opinion other than "get it at the pump" is "wrong". The OP simply asked which is better. I think the question has been answered. If you tow all the time where DEF usage increases, put lots of miles on your truck, and ALWAYS fill up at the cheapest station, DEF at the pump makes perfect sense. However, if you drive fewer miles and your use pattern uses less DEF, then packaged DEF makes sense. Not complicated. An yes, the actual cost per mile of packaged DEF increases the cost marginally...that is a fact. Now I think I'll hook up the boat and go fishing where I pay $8.50 a gallon for non ethanol gas, which is another issue for another day.
The point is and you even mentioned it that def at the pump is half the price, always fresher and creates zero waste.
Doesn't matter if you use 1 gallon or 100's of gallons the cost per gallon is the same.
No one that I recall ever said boxed def was bad. It's just ridiculously overpriced and creates more waste. It does have a shelf life and that can be an issue as well.
As far as def usage in the PSD's a programming change occurred in the 20+ year models where towing uses significantly more def than earlier year models. That makes this conversation even more meaningful and impactful as fuel costs continue to rise.
Mountain Pass
Joined: Sep 2021
Posts: 104
Likes: 56
Facts seem to be elusive to you. Not complicated at all. $4/gallon at the pump vs $8/galllon in the box is the same cost? That was the only thing I mentioned in that your math isn't remotely accurate. You can use your money as you wish. That was also not the point.
The point is and you even mentioned it that def at the pump is half the price, always fresher and creates zero waste.
Doesn't matter if you use 1 gallon or 100's of gallons the cost per gallon is the same.
No one that I recall ever said boxed def was bad. It's just ridiculously overpriced and creates more waste. It does have a shelf life and that can be an issue as well.
As far as def usage in the PSD's a programming change occurred in the 20+ year models where towing uses significantly more def than earlier year models. That makes this conversation even more meaningful and impactful as fuel costs continue to rise.
The point is and you even mentioned it that def at the pump is half the price, always fresher and creates zero waste.
Doesn't matter if you use 1 gallon or 100's of gallons the cost per gallon is the same.
No one that I recall ever said boxed def was bad. It's just ridiculously overpriced and creates more waste. It does have a shelf life and that can be an issue as well.
As far as def usage in the PSD's a programming change occurred in the 20+ year models where towing uses significantly more def than earlier year models. That makes this conversation even more meaningful and impactful as fuel costs continue to rise.
Laughing Gas
Joined: Aug 2017
Posts: 802
Likes: 197
From: Tupelo, MS
OK.....let me help you with the math. DEF in a package is $4 per gallon more than at the pump (that's $8 - $4 = $4). You go 1000 miles per gallon of DEF (less if towing). Therefore, 400 pennies more in package DEF divided by 1000 miles = 0.4 pennies per mile more. Hope that helps.
Tuned
Joined: Nov 2018
Posts: 398
Likes: 110
From: Southwest Montana & Idaho
That’s not even remotely accurate as to the cost differential. I posted this above and I’ll add it here again to make sure others are aware of actual costs comps:
Even now it's still cheaper at the pump. The last box of def I bought at TSC was $16 for 2.5 gallons. After tax that's almost $7/gallon. Last tank of def at the pumps was $4/gallon. Pretty easy math for me. Plus never have to worry about freshness of the boxes of def on the shelf or storing/hauling them around.
Even now it's still cheaper at the pump. The last box of def I bought at TSC was $16 for 2.5 gallons. After tax that's almost $7/gallon. Last tank of def at the pumps was $4/gallon. Pretty easy math for me. Plus never have to worry about freshness of the boxes of def on the shelf or storing/hauling them around.
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