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So, I waited until about 30% remaining until I filled my diesel emissions fluid tank for the first time hoping that two and a half gallons would fit and I wouldn't have to use too much of another container to top up if any at all. After all, two and a half gallons out of a 3.8 gallon tank is 34% roughly so I figured I'd be well clear. However, I still have about 16 to 20 oz of diesel emissions fluid remaining. Has anyone come up with a good number when they decide to fill their diesel emissions fluid tank? I'm not trying to hit it perfect every time I'm just trying to avoid having a container with 16oz is left in it.

Side note, it took about 2500 miles before I hit that 30%. Of course that's assuming the dealer topped it off when I bought it.

2017 AT Sedan
 

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So, I waited until about 30% remaining until I filled my diesel emissions fluid tank for the first time hoping that two and a half gallons would fit and I wouldn't have to use too much of another container to top up if any at all. After all, two and a half gallons out of a 3.8 gallon tank is 34% roughly so I figured I'd be well clear. However, I still have about 16 to 20 oz of diesel emissions fluid remaining. Has anyone come up with a good number when they decide to fill their diesel emissions fluid tank? I'm not trying to hit it perfect every time I'm just trying to avoid having a container with 16oz is left in it.

Side note, it took about 2500 miles before I hit that 30%. Of course that's assuming the dealer topped it off when I bought it.

2017 AT Sedan
Last week i ran my car down to 20% i put 2 1/2 in no problem. My car is the same as yours.

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70% of 3.8 Gal (if that’s the true DEF capacity) = 2.66 Gal. So the whole container should theoretically fit when level reads 30% (assuming the reading is accurate).

@sledstorm1 offers sound advice, run it down to 20% just to account for subtle inaccuracies. Even at 20% remaining you’ve still got many miles before the dreaded countdown to death.
 
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70% of 3.8 Gal (if that’s the true DEF capacity) = 2.66 Gal. So the whole container should theoretically fit when level reads 30% (assuming the reading is accurate).

@sledstorm1 offers sound advice, run it down to 20% just to account for subtle inaccuracies. Even at 20% remaining you’ve still got many miles before the dreaded countdown to death.
I usually wait until I get to 25%. Don't forget that there is a heater in the tank that takes up some of the room. I've had to replace mine in JULY. I didn't think I needed a heater when it was 102* during the day. Car went into limp mode. To speed were listed at :55mph for 99 miles, 45 for 25 miles, 35 for 25 miles, 25 for 25 miles.
 

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I let mine go down to the countdown last time. It was reading 10% right before it "helpfully" switched to the "low" message. I put 3.18 gallons in.
 
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