Trunk comparison: Audi A4 Avant vs Audi A6 Sedan

Summary of the Biggest Differences

The Audi A4 Avant offers a significantly greater height of the trunk opening (+13.8 in / +70%) compared to the Audi A6. In contrast, the Audi A6 has a significantly greater depth of the trunk (loading edge to trunk floor) (+2.8 in / +140%). Other differences are moderate: the A6 is longer in the loading floor (+4.7 in with folded seats, +3.9 in with upright front seats), the loading edge of the A6 is slightly higher (+1.2 in / +5%), the narrowest width in the trunk is minimally larger in the A6 (+1.2 in / +3%), and the width of the trunk opening is somewhat larger in the A4 Avant (+3.1 in / +9%).

What Are the Practical Implications of These Differences?

The A4 Avant is particularly suitable for tall or bulky items that need to be placed upright (e.g., furniture parts, tall boxes, bulky sports equipment) due to the significantly larger trunk opening height. The larger opening also makes loading and unloading easier without heavy tilting or sideways turning. Because the loading edge of the A6 is slightly higher (+1.2 in), lifting heavy items into the A4 is somewhat more ergonomic — however, the difference is small. The A6 scores with a significantly greater depth between the loading edge and trunk floor, meaning more vertical space below the loading edge, as well as longer loading surfaces with folded and upright seats. This makes the A6 better suited for longer or lower-lying cargo (e.g., long items, suitcases, tools), and it offers overall somewhat more volume when the seat configuration is utilized. However, the lower height of the opening can limit loading very tall items — such items may need to be transported lying down or fitted in more awkwardly. In short: A4 Avant = clear advantage for loading tall, bulky items and for more comfortable access; Audi A6 = advantage in depth, length, and usable cargo volume for longer/lying cargo.