The Mazda 3 is the family hatchback for buyers who have looked at a Golf and thought "yes, but is there something built more carefully?" There is. The fourth-generation Mazda 3 (BP, 2019 onwards) is one of the most thoughtfully engineered cars in its class — the interior material quality surpasses the Golf at equivalent price points, the driving dynamics are closer to a BMW 1 Series than most rivals acknowledge, and the build quality has a solidity that you notice within the first five minutes of sitting in the car.
The BP Mazda 3 also introduced the SkyActiv-X engine — Mazda's genuinely novel spark-controlled compression ignition petrol unit that blurs the line between petrol and diesel combustion. It's an interesting engine with a specific character, and whether it's the right choice for you depends on how you drive. This guide explains the difference between the SkyActiv-X and the more conventional SkyActiv-G, and which one to target for your circumstances.
Which body style?
The BP Mazda 3 is available as a fastback (a five-door body that Mazda calls a saloon but most buyers treat as a hatchback — the bootlid opens to reveal a shallow separate boot rather than a hatchback opening) and a saloon (a conventional three-box saloon with a separate boot).
The fastback is by far the more common body style in the UK. The boot opening angle on the fastback is the main practical concern — the sloping rear means the aperture is narrower at the top than a conventional hatchback, which makes loading tall items more awkward. Boot capacity is 351 litres. This is smaller than a Golf (374 litres) and noticeably smaller than a Skoda Octavia. If boot space is important, the Mazda 3 is not the class leader and you should test-load it before committing.
The saloon has a 444-litre conventional boot and better rear headroom for tall passengers. Less common in the UK (the fastback outsells it significantly) and occasionally available at a small discount as a result.
SkyActiv-X or SkyActiv-G?
This is the defining choice in the BP Mazda 3 range and worth understanding before you view any car.
The SkyActiv-G 2.0 (122PS, naturally aspirated petrol) is the conventional engine and the recommendation for most used buyers. A naturally aspirated 2.0-litre four-cylinder with the same linear throttle response that defines the Mazda 2 and earlier Mazda 3 generations. Real-world economy of 38–46mpg in mixed driving. Smooth, uncomplicated, and characterful in the way that naturally aspirated engines are — the throttle response rewards attentive driving in a way that turbocharged units don't.
The SkyActiv-X 2.0 (180PS, spark-controlled compression ignition) is Mazda's unique engine and the one that generated significant press coverage at launch. The SkyActiv-X achieves compression-ignition combustion (like a diesel) under certain load conditions while retaining conventional spark ignition for other conditions. The result is diesel-like torque delivery at low revs combined with petrol-like refinement at higher revs. Real-world economy is 40–50mpg in mixed driving — better than the SkyActiv-G but not as dramatically better as the WLTP figures suggest.
The SkyActiv-X's character is distinctive. It has more low-down torque than the SkyActiv-G, pulls strongly from low revs, and has an almost turbodiesel-like feel at 1,500–2,500rpm. At higher revs it becomes a conventional high-revving petrol. Some drivers find this transition unsettling; others find it genuinely engaging. Test drive the SkyActiv-X specifically before buying — it divides opinion and you need to know which side of that divide you're on.
The e-SkyActiv-G 150PS (2022 onwards) added a 24V mild-hybrid system to the 2.0-litre petrol, reducing fuel consumption in urban conditions. The improvement over the standard SkyActiv-G is modest but real. Post-2022 examples with the mild hybrid are the most refined petrol Mazda 3s.
Which trim level?
SE-L Nav+ is the entry BP trim in the UK — 8.8-inch infotainment with rotary controller (no touchscreen — Mazda deliberately retained physical controls), Apple CarPlay, rear parking sensors and camera, heated front seats, 18-inch alloys, LED headlights. Already well-equipped and the best value on the used market.
GT Sport is the mid-trim — 360-degree camera system, head-up display, Bose audio, adaptive LED headlights. These compress well in value on the used market and the head-up display is one of the better implementations in the class.
GT Sport Tech is the top specification — panoramic glass roof, driver attention monitoring, rear traffic alert. The panoramic roof significantly changes the interior atmosphere on bright days and is worth seeking out at a modest premium.
On the infotainment: the Mazda MZD Connect system with its rotary controller is one of the safer systems to use while driving — you don't need to take your eyes off the road to adjust temperature or change audio. The 8.8-inch screen does not have a touchscreen function when in motion, which is a deliberate safety choice. Some buyers find this frustrating initially; most adapt quickly and appreciate it.
What goes wrong?
SkyActiv-X fuel consumption versus expectations. Some SkyActiv-X owners report real-world fuel economy closer to the SkyActiv-G than the WLTP figures suggest, particularly in primarily urban driving. The compression-ignition mode functions best at sustained part-throttle loads — motorway driving, long A-roads — and the efficiency advantage is less pronounced in stop-start urban conditions. If the economy argument is the main reason for choosing the SkyActiv-X over the SkyActiv-G, reconsider.
SkyActiv-X requires premium fuel. The SkyActiv-X is designed for 95 RON fuel but performs best and returns best economy on 97–99 RON premium unleaded. Regular use of standard 95 RON fuel is not harmful but does reduce the efficiency advantage. Factor in the fuel cost difference if premium fuel use is required for your intended economy targets.
Rear visibility on the fastback. The sloping fastback roofline means rearward visibility is limited. The rear camera is therefore more important than on most cars in this class — confirm it works clearly on the test drive.
Early infotainment compatibility issues. The earliest BP Mazda 3 cars (2019 production) had some Apple CarPlay wireless connectivity inconsistencies. These were addressed by software updates. Confirm the infotainment is on current software on any 2019 car.
What you should actually pay
- SkyActiv-G 2.0 SE-L Nav+ (2019–2021): £16,000–£21,000
- SkyActiv-G 2.0 GT Sport (2019–2022): £18,000–£24,000
- SkyActiv-X 2.0 GT Sport (2019–2022): £20,000–£27,000
- e-SkyActiv-G 150PS GT Sport (2022+): £22,000–£28,000
- Saloon body style: typically £500–£1,000 less than fastback at equivalent spec
What does it cost to run?
Mazda 3 servicing at an independent specialist costs £100–£150 for an oil and filter service on the SkyActiv-G; the SkyActiv-X requires specific oil grade (0W-20 low-viscosity fully synthetic) and costs £120–£180 at an independent. Full annual service at an independent costs £170–£260. Mazda's service interval is 12,500 miles or 12 months.
The SkyActiv-G uses a timing chain (no belt, no scheduled replacement) and has no DPF. Running costs are genuinely low for a car of this quality level. Tyres are 215/45 R18 on SE-L Nav+ and GT Sport — £100–£140 per unit at an independent.
Mazda 3 residuals are stronger than most buyers expect — the BP generation's combination of genuine quality and distinctive styling has maintained used values better than many mainstream rivals. You pay a premium going in relative to a Vauxhall Astra or Kia Ceed; you recover more of it when you sell.
Check the MOT history before you go
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On the test drive: if testing a SkyActiv-X, drive on an A-road or dual carriageway at 40–70mph under light throttle — this is where the compression-ignition mode operates and where its character is most pronounced. Note whether the low-rev torque delivery suits how you actually drive. On any Mazda 3, test the rear camera specifically (important given rear visibility limitations). Test the rotary infotainment controller: if you've not used Mazda's system before, spend five minutes with it in a car park — most buyers adapt quickly.
Practical ownership notes
The Mazda 3's infotainment controller is worth a dedicated mention for new buyers. The 8.8-inch screen is operated by a rotary dial and physical buttons on the centre console when the car is moving — it takes approximately one week of daily driving to build muscle memory for the controls, after which most owners find it significantly less distracting to use than a touchscreen. The screen does accept touch input when the car is stationary (useful for inputting addresses). Voice commands work for basic functions. Give it a week before judging it.
Rear visibility on the fastback is genuinely limited — the sloping C-pillar creates a significant blind spot at the rear three-quarter position. The rear camera is not optional equipment for parking in tight spaces; it's a practical necessity. Confirm it is present and working clearly before buying any Mazda 3 fastback. The saloon body does not have this issue to the same degree.
The BP Mazda 3's seats are among the best-bolstered in the class for long-distance driving. On journeys over two hours, the seat support quality becomes a meaningful differentiator versus rivals with less thoughtfully designed seats. This sounds minor in a test drive; it becomes obvious on a motorway run.
Versus rivals
Against the Volkswagen Golf: the Golf has stronger residuals and a more established specialist network. The Mazda 3 has better interior material quality at equivalent price points, is more distinctive, and is typically cheaper to service independently. Close call at equivalent prices — the Golf if brand equity matters; the Mazda 3 if quality and character matter more.
Against the Toyota Corolla: the Corolla hybrid offers genuinely outstanding urban economy (50–60mpg in mixed use) and Toyota's reliability reputation. The Mazda 3 is more engaging to drive and has the better interior. Buy the Corolla if economy and reliability are the overriding priorities; the Mazda 3 if you want to enjoy the car as well as use it.
Should you buy one?
A 2020–2022 Mazda 3 in SkyActiv-G 2.0 GT Sport specification, with full Mazda service history, fastback or saloon: one of the most satisfying used family hatchback purchases available. The BP Mazda 3 is the kind of car that makes you understand why some buyers buy the same model three times in a row. It does the everyday things well, it rewards the driver who pays attention, and the interior quality is something you notice every time you get in.
Also see: Volkswagen Golf Buying Guide | Toyota Corolla Buying Guide | Honda Civic Buying Guide