Trunk comparison: Audi A6 Avant vs BMW X4

Loading Length

With the seats folded down, the Audi A6 Avant offers a cargo area that is 9.4 in (14%) longer than the BMW X4. Even in the normal condition (first row of seats upright), the A6 Avant is 5.9 in (15%) longer.

Practically, this means the A6 Avant is significantly better suited for long items (e.g., slats, furniture parts, skis) and overall provides more usable depth when loading.

Loading Edge and Trunk Depth

The loading edge of the BMW X4 is 5.9 in (23%) higher above the road than that of the A6 Avant. Additionally, the depth from the loading edge to the trunk floor in the BMW X4 is 2.4 in (300%) greater. Practical implications:

• The higher loading edge in the BMW X4 means heavy luggage or bulky loads must be lifted higher — ergonomically less favorable compared to the lower A6 Avant.
• The greater depth in the BMW X4 means the cargo sits further below the edge. This can hold smaller or loose items more securely in the trunk but makes sliding in large, bulky parts less practical and removing deeply placed cargo more cumbersome.

Width and Opening

The narrowest trunk width is the same in both models. The width of the A6 Avant’s trunk opening is only 0.4 in (1%) larger — thus negligible. The height of the trunk opening differs by only 1.2 in (4%) in favor of the A6, so it is not a decisive factor.

Conclusion

For users who want to transport long items or regularly larger volumes, the Audi A6 Avant is the more practical choice due to the significantly longer cargo area.

The BMW X4 scores with a deeper loading well that holds smaller items more securely but has ergonomic disadvantages when lifting and loading heavy or bulky cargo due to the significantly higher loading edge and deeper loading floor.