Trunk comparison: BMW i4 vs Seat Leon

Key Differences

The BMW i4 clearly offers more space in the trunk's length dimension: with the seats folded down, it is 10.6 in (18%) longer and with the first row upright, 5.9 in (18%) longer than the SEAT Leon.

The SEAT Leon, on the other hand, has advantages in the loading and build geometry: the height of the trunk opening is 5.1 in (19%) larger, the depth of the trunk (loading edge to floor) is 5.9 in (150%) greater, and the width of the trunk opening is 5.9 in (16%) wider than in the BMW i4. The loading edge height (+2 in / 7%) in favor of the SEAT Leon and the narrowest trunk width (+2.8 in / 9%) favoring the BMW i4 do not exceed 10%; these differences are significantly smaller and less decisive.

Implications for Usability

BMW i4 – longer loading surface: The greater length dimension makes the i4 more practical for long items (e.g., skis, slats, long boxes, or furniture parts). Especially with folded seats, it allows flatter, longer loading positions and thus better use of the cargo space for bulky, elongated loads.

SEAT Leon – larger opening height, significantly deeper cargo well, and wider opening: The higher and wider trunk opening makes it much easier to load wide or bulky items.

The significantly greater depth between the loading edge and trunk floor creates more usable volume in the cargo well and allows stacking or accommodating taller items behind the loading edge. Overall, the Leon is more practical for bulky, tall, or bulky cargo that requires more height than length.

Compromises: The slightly higher loading edge in the SEAT Leon (+2 in / 7%) means a bit more lifting effort when handling heavy items but is not a major disadvantage.

The slightly greater narrowest width in the BMW i4 (+2.8 in / 9%) is a small advantage when fitting very narrow loads but falls below the 10% threshold and is less relevant in everyday use.

Conclusion

In short: Those who frequently transport long items or need the longest loading surface are better served by the BMW i4. Those who often load and unload wide, tall, or bulky cargo and benefit from a larger opening and a deeper cargo well should prefer the SEAT Leon.