K4 vs WRX
Kia brings the K4; Subaru answers with the WRX. Both play in the compact car class. Each has a clear strength: the K4 leads on fuel economy & range, and the WRX answers with engine & performance.
At a glance
- Engine & Performance WRX wins
- Fuel Economy & Range K4 wins
- Space & Practicality Tie
- Off-road & Towing WRX wins
- Engine & Performance0.0
- Fuel Economy & Range5.9
- Engine & Performance7.3
- Fuel Economy & Range0.0
Spec scores (0 to 10) are calculated from manufacturer specs against other models in the same class. See how the formula works. They are not reviews or user ratings.
Key Differences
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The WRX has 124 hp more power
Here the WRX pulls well ahead of the K4, with 271 hp compared to 147 hp. Power is only part of the story; weight, gearing and torque delivery shape how quick a car feels.
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The K4 has better fuel economy
The K4 doesn’t just edge this one; 34 mpg against 22 mpg is a lead you’ll feel. The K4 uses less fuel on the standard combined cycle, which matters most if you drive a lot.
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The WRX has 126 lb-ft more torque
Big gap, real consequences. The WRX’s 258 lb-ft versus the K4’s 132 lb-ft changes how the two compare in daily use. The WRX’s extra torque makes it more relaxed when fully loaded or towing.
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The K4 has better city fuel economy
The WRX is clearly behind on fuel economy (city) (19 mpg against 30 mpg), and that’s one of its biggest weak spots in this matchup. City fuel economy matters most if your driving is mostly short trips, traffic and stop-and-go commutes.
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The K4 has better highway fuel economy
On this line of the spec sheet, the K4 is in a different league: 40 mpg, next to 26 mpg for the WRX. The K4 uses less fuel on the highway, a real saving on road trips and long commutes.
Design & Size
On overall dimensions, the K4 and the WRX are separated by very little.
Dimensions
| Spec | K4 | WRX |
|---|---|---|
| Length | 185.8 in | 183.8 in |
| Width (no mirrors) | N/A (not specified) | 71.9 in |
| Height | N/A (not specified) | 57.8 in |
| Wheelbase | 107.1 in | 105.4 in |
Engine & Performance
WRX leads
This is one of the WRX’s strongest areas. On engine & performance, the K4 falls well short. The WRX delivers 124 hp more power. More power helps with merging, overtaking and climbing hills, especially with passengers and luggage on board. On engine & performance alone, the WRX gets the nod.
Total system output
K4: 147 hp WRX: 271 hp The WRX’s extra output gives it more in reserve when you need to get up to speed.
Torque
K4: 132 lb-ft WRX: 258 lb-ft Electrified powertrains deliver torque instantly, so compare torque figures alongside the powertrain type.
Fuel Economy & Range
K4 leads
The fuel economy & range numbers point firmly in one direction: toward the K4. On its side, the K4 has better fuel economy. Official figures rarely match real-world driving exactly, but the ranking between two cars tends to hold. The takeaway: on fuel economy & range, the K4 is the stronger car.
Fuel economy (combined)
K4: 34 mpg WRX: 22 mpg Better combined fuel economy lowers your running costs every week, and the savings add up over years of ownership.
Fuel economy (city)
K4: 30 mpg WRX: 19 mpg Hybrids often shine in the city, and the K4 has the better rating here.
Space & Practicality
Too close to call
Both the K4 and the WRX cover space & practicality equally well on paper. If space & practicality was going to be your tiebreaker, you’ll need a different one.
Off-road & Towing
WRX leads
Call it a small but real win for the WRX in this area. Choose the WRX and you get available all-wheel drive. Available all-wheel drive improves traction in rain, snow and on loose surfaces. For off-road & towing, the WRX is the one to beat.
AWD / 4WD available
K4: no WRX: yes The WRX offers all-wheel drive; the K4 doesn’t, which matters if you face harsh winters.
Safety & Tech
Nothing to tally in the safety & tech section, but plenty to read. The table lists what the K4 and the WRX each use.
Full Specifications
Engine & Performance
| Spec | K4 | WRX |
|---|---|---|
| Powertrain | Gas | Gas |
| Engine | 2.0L I4 | 2.4L turbo flat-4 |
| Total system output | 147 hp | 271 hp (winner) |
| Torque | 132 lb-ft | 258 lb-ft (winner) |
| Transmission | IVT (CVT) | 6-speed manual |
| Drivetrain | FWD | AWD |
Fuel Economy & Range
| Spec | K4 | WRX |
|---|---|---|
| Fuel economy (combined)EPA estimate where available | 34 mpg (winner) | 22 mpg Thirstiest in class |
| Fuel economy (city) | 30 mpg (winner) | 19 mpg Thirstiest in the city |
| Fuel economy (highway) | 40 mpg (winner) | 26 mpg Thirstiest on the highway |
Space & Practicality
| Spec | K4 | WRX |
|---|---|---|
| Seats | 5 seats | 5 seats |
| Cargo (behind rear seats) | N/A (not specified) | 12.5 cu ft Smallest cargo area |
Off-road & Towing
| Spec | K4 | WRX |
|---|---|---|
| AWD / 4WD available | No | Yes (winner) |
Safety & Tech
| Spec | K4 | WRX |
|---|---|---|
| Largest touchscreen | 12.3 in Biggest touchscreen | N/A (not specified) |
| Driver-assist suite | Kia Drive Wise | N/A (not specified) |
| Basic warranty | 5 yr / 60,000 mi | 3 yr / 36,000 mi |
Dimensions
| Spec | K4 | WRX |
|---|---|---|
| Length | 185.8 in | 183.8 in |
| Width (no mirrors) | N/A (not specified) | 71.9 in |
| Height | N/A (not specified) | 57.8 in |
| Wheelbase | 107.1 in | 105.4 in |
“N/A” means the manufacturer does not specify the value or we could not confirm it. Figures marked “manufacturer rating” are the maker’s own claims, not our measurements.
Which One Should You Buy?
Choose the K4 if…
- you want better combined fuel economy (34 mpg vs 22 mpg)
- you mostly drive in town (30 mpg vs 19 mpg in the city)
- you cover long highway distances (40 mpg vs 26 mpg on the highway)
Choose the WRX if…
- you want more power (271 hp vs 147 hp)
- you often drive loaded up or with a trailer (258 lb-ft vs 132 lb-ft of torque)
- you want all-wheel drive available
Also Compared
Frequently Asked Questions
Should I buy the K4 or the WRX?
It depends on your priorities: the K4 is stronger on fuel economy & range, while the WRX leads on engine & performance.
Is the K4 bigger than the WRX?
The K4 and the WRX are so close in size that you’d struggle to tell them apart on dimensions alone.
Executive Summary
Let’s set the logos aside for a minute. The K4 and the WRX are close competitors, and their spec sheets tell an interesting story. It’s hard to argue with better fuel economy, which is exactly what the K4 brings. Another thing in the K4’s favor is better highway fuel economy. Where the WRX fights back is 124 hp more power.
Fit matters more than scores here. The K4 suits buyers focused on fuel economy & range; the WRX suits those focused on engine & performance.
My pick: whichever matches your priority, since fuel economy & range means the K4 and engine & performance means the WRX.
Personal opinion based on the data above. Your priorities may differ.