In the event that you're wondering exactly how much DEF does a truck use , you aren't alone, because it's one of these recurring costs that can really hunt your bottom series in case you haven't carried out the math. Considering that the EPA tightened up emissions standards back in the year 2010, Diesel Exhaust Liquid (DEF) has essentially become as essential as the diesel-powered itself. You can't just ignore that little blue gauge on the dash plus wish for the best.
So, let's get right into the numbers. Most contemporary heavy duty trucks follow a pretty standard principle of thumb: you're going to use regarding 2% to 3% of DEF relative to the amount of diesel you're burning. To put that in plain English, for each 100 gallons associated with diesel you pump into your storage containers, you'll probably need to add about two or three gallons of DEF.
While that sounds like a tiny amount, those gallons begin adding up fast when you're hauling cross-country or running a fleet of delivery rigs. It isn't nearly the price, either—it's concerning the logistics of keeping that will tank full so your truck doesn't decide to toss a tantrum and go into "limp mode" in the middle of nowhere.
What's the magic number for your particular rig?
While the 2-3% variety is the sector standard, it isn't a hard principle that applies in order to every single person on the street. Some drivers find they can extend a tank associated with DEF much further, while others experience like they're continuously sticking the nozzle in that small blue cap.
If you're driving a regular Class 8 partial, you might have got a DEF container that holds anyplace from 10 to 20 gallons. If you're averaging close to 6 or 7 miles per gallon on diesel, you're looking at a DEF refill each 3, 000 to 4, 000 miles or so. Associated with course, if you're driving a heavy-duty pickup like a Ford F-250 or a RAM 2500, those numbers change because the tanks are smaller and the engines aren't working quite as hard as a big rig hauling eighty, 000 pounds.
On those smaller sized consumer trucks, you might only need to top off the DEF every five, 000 to seven, 000 miles. But again, it all is dependent on what you're doing using the truck. If you're just commuting, the usage is low. When you're towing a massive 5th-wheel movie trailer through the Rockies, expect that DEF gauge to drop way faster.
Why some vehicles drink significantly more DEF compared to others
It's tempting to think that DEF consumption is just a fixed rate, but several factors can make your truck a lot "thirstier" for your blue stuff. The largest factor is almost always load weight .
When your engine is under a heavy fill, it runs hotter and produces more NOx (nitrogen oxides). Since the whole point of DEF is to counteract those nasty fumes within the Selective Catalytic Reduction (SCR) program, a harder-working motor means the pc is going to spray more DEF in to the exhaust flow. If you're carrying a "sail" (an empty van) within a headwind, or even you're maxed out on weight, your 2% consumption may jump closer to 4% or 5%.
Another huge aspect is idle time . A wide range of men think that idling doesn't use much DEF because the truck isn't shifting, but that's a little bit of a myth. When you aren't burning as much fuel when you would at road speeds, your SCR system still needs to stay at a certain temperature to work. Excessive idling can in fact lead to crystallization issues in the particular system, which ultimately forces the truck to work more difficult (and use even more fluid) to obvious things out.
Does your driving style actually issue?
Believe this or not, your own right foot plays a role within how much DEF a truck utilizes. We all know that "lead foot" driving kills your fuel economic climate, but it's a double whammy with regard to DEF. Fast speeding and high-speed cruising keep the engine in a high-output state, which naturally increases emissions.
In the event that you're the type of driver that likes to sustain a steady, reasonable pace and uses cruise control effectively, you'll probably discover your DEF will last a lot more. It's all about efficiency. The greater efficiently you burn your own diesel, the less work the SCR system needs to perform on the back end.
The nightmare of running out
If you're new to the world of DEF, a person might wonder what happens if a person just don't fill it. Let myself save you the particular headache: don't test it. The truck won't just keep working like it's no big deal.
The software program in modern vehicles is designed to be extremely persistent about emissions. First, you'll get a number of warnings—usually starting once the tank is 10% or 15% complete. If you ignore those and allow the tank strike zero, the truck will eventually get into a de-rate mode , often called "limp mode. "
This is usually exactly as fun as it noises. Your engine strength is going to be drastically cut, and finally, the truck might limit your own speed to a crawling 5 mph. The only way to fix it is to add DEF. In some extreme cases, if the system senses you've been running dry for too long, a person might even require a technician in order to reset the computer or even perform a regular regeneration. It's a massive waste associated with time and cash for something that takes five minutes to fix from a pump.
Buying in mass vs. purchasing the containers
When you're calculating how much DEF you're going to use, you also have to think regarding how you're purchasing it. If you're a long-haul trucker, you're more often than not heading to fill upward at the pump. It's cheaper, faster, and you don't have got to deal along with heavy plastic jugs.
However, when you're a nearby driver or you manage a small fast that returns in order to a yard each night, you might be buying 2. 5-gallon jugs or even even 55-gallon percussion. If you're buying the jugs at a gas station or a big-box store, you're paying a massive premium. The cost per gallon for boxed DEF is frequently double what you'd pay at a dedicated DEF push at a truck stop.
If you understand you're likely to be using a large amount of it—which, as we've established, you will—it's worth looking into a bulk delivery program for your shop. It saves cash, also it keeps these plastic containers out there of the landfill.
Temperature plus storage quirks
One thing individuals often forget whenever referring to DEF use would be that the stuff will be basically just urea and deionized water. Because it's mostly water, it freezes with about 12 degrees Fahrenheit .
If you're trucking through a brutal winter in North Dakota or even Canada, don't panic. Trucks are created with heating components in the DEF tank and outlines to thaw the particular fluid out rapidly. However, you may observe that your intake levels seem a bit weird in the dead of winter. The system won't start spraying DEF until the fluid is thawed as well as the SCR is upward to temp, therefore you might in fact use less DEF on really short trips in the cold—though this isn't exactly "saving" money, as it's just the program waiting to indulge.
On the flip side, temperature is the enemy associated with DEF storage. When you keep a few jugs in your tool container and they cook in the sun all summer time, the fluid can actually degrade. Old or "spoiled" DEF can trigger messfühler errors and make the truck think it's low or that will the fluid quality is poor.
The bottom collection on DEF consumption
So, with the end associated with the day, how much DEF does a truck use? Most drivers find that the 3% guideline is definitely the safest wager for budgeting. When you're running a heavy load, policy for 4%. If you're light and generating like a pro, you might obtain away with 2%.
It's just another part associated with the modern trucking landscape. While it's an extra cost and another tank to keep an eye on, it beats the alternative associated with the old-school black smoke and the particular environmental impact that will included it. Just keep that azure gauge in your peripheral vision, grab the pump anytime you're fueling up with diesel, plus you'll never possess to worry about the dreaded 5 mph sagging mode.