Trunk comparison: BMW i4 vs Tesla Model Y

Key Differences

In terms of cargo space, there is a clear advantage for the Tesla Model Y in usable length: The Model Y is 5.1 in (13%) longer when the first row of seats is upright, allowing longer items to fit without folding down additional seats.

In contrast, the BMW i4 has a significant advantage in vertical depth: The BMW offers 3.9 in (900%) more distance from the loading edge to the trunk floor, meaning considerably more usable depth between the loading edge and the floor.

Other, Smaller Differences

When all seats are folded down, the Model Y is 7.1 in (10%) longer than the i4 (just at the 10% mark). The trunk opening of the Model Y is 0.8 in (3%) higher, and both the narrowest internal width and the opening width are about 2.8 in (7–8%) larger in the Model Y. The loading edge height is the same on both models.

Implications for Usability

Due to the greater usable length (Model Y), long items — such as skis, poles, or longer furniture parts — can be transported more easily, often without folding down seats. The slightly wider opening and interior width of the Model Y also make loading and unloading wider items easier.

The significantly greater depth of the BMW i4 affects vertical volume: boxes, bags, or bulky but not very long items can be stacked better and sit deeper in the trunk.

Since the loading edge height is the same, the loading height does not change, but the amount of usable storage space below the loading edge favors the i4.

Conclusion

For users who frequently transport long items, the Tesla Model Y is the more suitable choice. For those who need more depth volume and better stackability of smaller/bulkier cargo, the BMW i4 offers the greater practical advantage.

Smaller advantages in width and opening slightly favor the Model Y, while the identical loading edge height makes loading comparable in both models.