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Cadillac CT4 Vs. CT5: Comparing Cargo Space and Dimensions

2020 Cadillac CT4 and 2020 Cadillac CT5 trunk space 2020 Cadillac CT4 (top), 2020 Cadillac CT5 (bottom) | Cars.com photo by Kelsey Mays

The Cadillac CT5 has less cargo space, by a smidge, than its smaller CT4 sibling, according to Cars.com’s field tests of both sedans. Cadillac introduced them for 2020 as a two-pronged approach to the packed field of small luxury sedans. Delineations can get tricky, given their similar styling, drivelines and base engines. Average listing prices on Cars.com for new examples are only about 10% apart, too, at $42,857 for the CT4 and $47,295 for the CT5 as of this writing.

Related: Which SUVs, Minivans and Sedans Have the Most Cargo Space?

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More difference comes in size, however. The CT5 rides a 6.7-inch-longer wheelbase, with overall length up roughly the same amount. In short, the CT5 is notably larger — and that shows up in the backseat, where the CT5 has adult-friendly knee clearance versus the CT4’s cramped confines. So it may come as a surprise that the extra dimensions don’t translate to more cargo space, at least by our measurements:

  • 2020 Cadillac CT4: 13.7 cubic feet
  • 2020 Cadillac CT5: 13.3 cubic feet

Cadillac quotes 11.9 cubic feet of cargo volume in the CT5 and just 10.7 cubic feet in the CT4, but our testing indicates those numbers may skew a bit conservative. Our measurements flip-flop the order, with the CT4 providing slightly more room than the CT5.

Given we only observed some 3% more cargo space in the CT4 versus the CT5, you’ll likely find real-world space roughly similar between the two trunks. In any case, both are small. When we compared three mass-market compact sedans — the Honda Civic, Nissan Sentra and Toyota Corolla — earlier this year, we observed close to 20 cubic feet in each trunk.

The CT4 measured was a CT4-V, while the CT5 was a Premium Luxury trim; both examples had all-wheel drive. In both cases, our accounting of cargo space included slight volume under the cargo floor, as neither test car had a spare tire. You’ll likely find similar space on that count, as the 2020 CT4 and CT5 lack spare tires in any trim. Both test vehicles had optional, speaker-laden Bose premium stereos, but we didn’t observe any cargo-area protrusions from stereo speakers beyond the trunk ceiling at the backseat shelf. That’s a typical space for stereo speakers, premium audio or not.

Editor’s note: This story was updated Aug. 19, 2021, after making slight revisions in late 2020 to cargo methodology for enclosed trunks. The volumes above are estimated based on these revisions.

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