According to Consumer Reports’ fuel-economy testing, adding a roof rack and rooftop carrier produced an overall 19% drop in fuel economy on its test vehicle—exactly the kind of “workaround tax” people pay when the cargo plan fails. Car and Driver’s back-to-back test found the same direction at highway speed: 25 mpg with a hitch-mounted carrier versus 21 mpg with a rooftop box on the same vehicle and route. The packing mistake that triggers this cascade is simple: building the load around one rigid, blocky item (a hard cooler or hard suitcase) placed first at the hatch, which blocks access, wastes corner space, and forces a roof box (or a second vehicle) far sooner than necessary.
Quick takeaways
- The mistake isn’t “bringing too much.” It’s packing rigid items first at the hatch, turning the cargo area into a blocked doorway.
- When access fails, people reach for rooftop cargo—yet Consumer Reports measured an overall 19% fuel-economy drop with a rack + rooftop carrier installed.
- Car and Driver’s test showed 25 mpg (hitch) vs 21 mpg (roof box) on the same route, making the workaround cost concrete.
- NHTSA notes cargo should be secured to prevent it from dropping, shifting, leaking, or escaping—packing method affects safety, not just convenience.
- Best fix: pack for seats-up reality with soft modules, a “cooler lane,” and one-item access at every stop.
What changed in 2026: the workaround got more expensive
Small SUVs haven’t suddenly shrunk. What changed is how quickly a bad packing method turns into recurring costs.
Consumer Reports’ testing shows rooftop carriers can cut fuel economy by about 19% overall on its test setup.
Car and Driver’s back-to-back testing on a Grand Highlander found a roof box cost 4 mpg versus a hitch carrier (21 vs 25 mpg).
Translation: when the small SUV “feels too small,” the common fix (roof cargo) now has a measurable highway penalty.
The packing mistake, defined: the “doorway blocker”
Most people pack a small SUV like an airport cart:
- put the biggest rigid piece in first,
- then stack around it,
- then deal with access later.
On a two-night trip, the usual rigid piece is:
- a hard cooler, or
- a hard-shell suitcase.
When that rigid item goes in first and lands at the hatch, it becomes a doorway blocker:
- it prevents grabbing one bag quickly,
- it forces unloading at every stop,
- and it encourages overfilling because the back feels “full” even when corners are empty.
This is how a small SUV starts feeling wrong fast: not because it lacks volume, but because the usable volume becomes trapped behind a rigid wall.
Why the mistake shows up on weekends (not commutes)
Commutes don’t require repeated cargo access. Weekend trips do.
A normal weekend stop cycle looks like:
- coffee stop,
- grocery/ice,
- trailhead or hotel check-in,
- dinner parking,
- “grab one jacket” at the wrong moment.
If the hatch is blocked by a rigid item, every stop becomes a mini-unload. That makes the car feel too small even if the total cargo would have fit with a smarter layout.
How the mistake pushes you into expensive workarounds
Once the cargo area feels blocked, drivers reach for three workarounds:
1) Rooftop carrier
It “solves space” but adds highway drag. Consumer Reports measured an overall 19% fuel-economy drop with a rack + rooftop carrier installed.
2) Hitch carrier
Often less of an aerodynamic penalty than roof boxes in testing, but it changes length and access. Car and Driver’s test showed 25 mpg with a hitch carrier versus 21 mpg with a roof box.
3) Second car
The ultimate workaround: split people and gear. It can double parking hassle and stop-cycle coordination.
The point: a simple packing error can trigger a chain of decisions that costs more than expected.
The safer, calmer fix: pack for seats-up access, not max volume
NHTSA’s guidance stresses that cargo should be secured so it won’t drop, shift, leak, or escape.
A stable load starts with the right geometry.
The “cooler lane” rule
If a cooler is coming, it gets one job:
- sit flat on the cargo floor,
- near the hatch or against one side,
- so one bag can still be reached without moving it.
The cooler should not become the doorway.
Use soft modules, not hard rectangles
Soft duffels and packing cubes:
- compress into corners,
- fill wheel-well voids,
- and allow a reach path.
Hard suitcases often waste corner space and create “dead gaps” that can’t be used.
Keep one-item access sacred
Before leaving:
- open the hatch,
- grab one duffel,
- close the hatch.
If you can’t do that without moving the cooler or unstacking, the pack is wrong.
What this means in the U.S.
U.S. weekend trips are often highway-heavy with stop-heavy destinations. That combination makes the packing method matter more than the cargo spec:
- highway miles amplify drag penalties,
- destinations amplify access friction.
So the “small SUV feels too small” moment is often self-inflicted—and fixable.
What you can do: the 6-minute “no-regret pack”
- Set seats as you travel (don’t plan on folding later).
- Place the cooler flat but leave a reach lane.
- Soft bags on both sides to eliminate gaps.
- Top layer is light (jackets, snacks) and won’t avalanche.
- Secure the load so it won’t shift (strap or wedge as needed).
- One-item access test: grab one bag without moving the cooler.
Bottom line
The packing mistake that makes a small SUV feel too small too fast is letting one rigid item become the doorway at the hatch. It blocks access, wastes corner space, and pushes drivers into costly workarounds. Testing makes that cost tangible: Consumer Reports measured a 19% fuel-economy drop with a rooftop carrier installed, and Car and Driver found 25 mpg (hitch) vs 21 mpg (roof box) on the same route. Pack for seats-up access first, and the “too small” feeling often disappears.