Trunk comparison: Audi A4 Avant vs BMW X4

Key Differences

Three significant differences stand out in the comparison: The trunk opening of the Audi A4 Avant is 5.9 in (≈21%) higher than that of the BMW X4. The loading edge of the BMW X4 is 6.3 in (≈25%) higher above the ground than that of the A4. Additionally, the depth of the trunk (measured from loading edge to trunk floor) in the BMW X4 is 1.2 in (≈60%) larger than in the A4. All other differences (length with folded seats +4.3 in / 6%, length with rear seats upright +1.2 in / 3%, width each +0.4 in / 1%) are minor and practically insignificant.

Impact on Usability

The higher trunk opening of the Audi A4 Avant makes loading tall or bulky items easier: plants, boxes, or furniture can be placed more upright and require less tilting or repositioning. This is a clear advantage for users who often transport tall cargo.

The BMW X4 brings two contradictory features compared to the A4: The loading edge is significantly higher, meaning lifting heavy items over the threshold requires more effort and is less comfortable (especially with frequent loading).

At the same time, the interior space behind the loading edge is somewhat deeper, allowing items to slide further "inside" and be better positioned — this can be useful for longer or flat-lying loads and increases the usable interior space below the opening.

Practical conclusions: For users who frequently load and unload heavy or bulky items and value ergonomic handling, the Audi A4 Avant is more favorable due to the lower loading edge and higher opening.

Those who more often store longer, flat-lying cargo and benefit from items lying further inside the trunk (deeper cargo floor) may find advantages in the BMW X4 — but must accept the higher lifting over the loading edge.