Trunk comparison: Audi Q5 vs Renault Austral

Summary of Differences
No measured difference exceeds 10%: no values >10%.
Specific deviations (Audi minus Renault): trunk length with seats folded +2.4 in (≈4%), trunk length with front row upright +3.5 in (≈10%), trunk opening height +2.4 in (≈8%), same trunk depth (loading edge → floor), loading edge of the Austral is +1.6 in (≈5%) higher, narrowest trunk width on the Audi +1.6 in (≈4%), opening width +0.4 in (≈1%).
Impact on Usability
The differences are overall small but cumulative: the Audi Q5 offers slightly more usable length (especially with seats folded or nearly at the 10% mark with front row upright) and a higher opening, which makes storing tall items easier.
The slightly greater narrowest width on the Q5 and the minimally larger opening width slightly improve loading wider items.
The Renault Austral has a loading edge 1.6 in higher, which makes lifting heavy loads in and out somewhat more difficult; for frequent lifting or very bulky/tall cargo, the Q5 is therefore more practical. In everyday situations (shopping, luggage, stroller), the differences are mostly unnoticeable.
Conclusion
No model has a clearly dominant advantage: the Audi Q5 is slightly better in length, opening height, and narrow width and thus better suited for tall or bulky cargo; the Renault Austral is overall comparable but loses some practicality due to the higher loading edge. For most users, however, the differences are minor.