Trunk comparison: Audi A6 Avant vs Mercedes Benz GLC

Key Differences

The Audi A6 Avant offers significantly more loading length: with the seats folded down, the trunk is 8.3 in (+12%) longer, and with the first row upright, it is 9.4 in (+26%) longer than the Mercedes‑GLC.

Additionally, the depth of the trunk (distance from loading edge → trunk floor) is 0.8 in (+100%) greater in the A6. In contrast, the GLC's loading edge is 2.8 in (+11%) higher above the road.

Smaller advantages of the GLC include a trunk opening that is 1.2 in (+4%) higher and 2.4 in (+6%) wider; the narrowest trunk width is 3.9 in (+10%) larger in the GLC (not >10%).

Impact on Usability

The longer cargo areas of the A6 Avant make it more practical for long items (e.g., furniture, skis, long boxes) and for larger overall loads with the seats folded down.

The greater depth (loading edge → floor) supports secure placement of longer or deeper cargo. Because the loading edge is lower in the A6 (GLC +2.8 in), loading and unloading heavy items is easier — less lifting effort.

The GLC scores points in width installation dimensions and opening height: the slightly higher opening and wider passage facilitate loading bulky, tall, or wide-based items. However, the overall shorter loading length of the GLC limits the ability to transport very long cargo flat.

Conclusion: For longer or flat-lying loads as well as easier lifting and loading, the Audi A6 Avant is the more practical choice. For wider or taller individual items, the Mercedes‑GLC can offer advantages but loses out on usable length compared to the A6.