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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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