2020 Mazda 6 vs Mazda 3

What's the difference?

Mazda6 wagon, with its impressive dynamics, great practicality and value. The Atenza grade adds another level of luxury but also look at the GT, which has the same engine and an almost identical features list. Oh, and you don't have to put a bed in the back like I did, but it's good to know you can.

The SkyActiv-X pushes the Mazda3 to new heights of refinement and reinforces the fact it’s still one of the best cars behind the wheel amongst its peers.

Mazda has made it subtle to a fault, so people will just have to believe you when you tell them this expensive little car pushes the bounds of how a non-turbo 2.0-litre engine can feel.

It’s great to see this new tech really does what it says it will do though, so we’re keen to see where Mazda can take it from here.

Despite being heckled for driving a Mazda6 wagon to an old-school rod festival, more than a few punters inside wanted to take a look at it. One mate who's an auto spray painter even called it a "Mazdaratti" for its high-end looks and was impressed with the Machine Grey paint it wore.

I'm a fan of the hue, too and also the car's styling, with that glittering grille, the broad bonnet and the low-slung stance. The interior is also outstanding in its design and the materials used. From the Nappa leather seats to the layered dash with its suede-like trim, it's a premium-feeling cabin.

If there are any criticisms it's that the cabin is feeling dated compared to the cockpit of the new-generation Mazda3, with its beautiful and modern insides boasting an integrated display and a more minimal design to buttons and switchgear.

How big is the Mazda6 wagon? The Mazda6's dimensions show it to be 4865mm long, 1840mm wide and 1450mm tall. That's big, and only about 210mm shorter in length than a CX-9. How does its size affect the driving? You'll have to read on to find out.

There’s nothing interesting about the SkyActiv X’s design at all. In fact, from the outside, the only way you’d be able to tell this car apart from a regular Astina is the SkyActiv X badge on the back. There are no funky eco-look wheels, coloured pinstripes, or sticker-work as some other brands choose to go with.

I hope you weren’t trying to impress your neighbors with your damn-fangled engine tech then, because they’ll be none the wiser. Then again, they probably wouldn’t be able to tell a Hybrid Corolla apart from a regular one, so maybe subtlety is key here.

Inside is the same deal. There are no badges, alternate trims, or coloured highlights to let you know you’re in something a bit different.

The most significant change on the inside is buried two menus deep in the multimedia system. It’s a new energy monitoring screen to add to the fuel monitoring suite which shows you how power is being used in the car, and importantly, whether or not the engine is using the special combustion technology. There are some conditions on it which we’ll explain later.

So, it’s not special to look at, but does it need to be? Most people would say no. We all know the Mazda3 is a great looking car (arguably one of the best in this segment) whether you choose the sedan or hatch, so at least you won’t have to make a drastic style choice either way.

Any car you can put a double-bed camp mattress into and sleep in has to be practical, right? As you can see from my images, that's just what I did when I took the Mazda6 Atenza wagon to a hot-rod festival that went over a weekend. The temperature dropped to -2C but I was cozy in my Mazda6 camper.

I don't suggest anyone else should do the same, but even for me, at 191cm tall, there was enough room to stretch out with the tailgate shut – those second-row seats fold flat and open up to give you a cargo capacity of 1648L (VDA).

Put those seats back into the upright position and the boot space is still good at 506 litres. You'll find hooks for hanging bags and a 12V outlet in the boot, too.

Cabin storage is also good, with two cup holders in the second row and another two up front. There's a big centre-console bin with two USB ports and a 12V outlet and pretty decent-sized door pockets, too.

People space is good, but not fantastic. I can sit behind my driving position but only have enough room between my knees and the seat back to squeeze in one of my fingers.

Headroom back there is getting tight, too, and that's because of  that swoopy roof line. The low roof and small door openings also make it hard to lift babies in and out. Parents will have to bend over further than in an SUV. This is one of the advantages of an SUV's ride height. That said, for kids who can climb in on their own, the wagon's height is ideal.

While we're talking ride height, SUVs tend to have high boot-load lips that you're forced to heave your bags and shopping over - not so with the Mazda6 wagon.

Again, no major changes to report here. The Mazda3 remains the same as before inside and out when it comes to dimensions. This means healthy space for front occupants, complete with lovely soft leather-clad trims on the doorcards and centre console for your elbows.

There are two smallish cupholders somewhat clumsily placed in front of the shift lever, a small binnacle in front of that, a large centre console box, and useful bins in the doors.

The pared back design makes for ergonomic button controls. Mazda’s dial-controlled media system takes a bit of getting used to, especially when using CarPlay or Android Auto, but some prefer it. Rear visibility is less compromised in the sedan as tested compared to the closed-in space which features on the hatch.

Back seat occupants get average legroom for the class, although they will benefit from the same relatively lavish soft leather-trimmed surfaces.

Boot space continues to be an issue for the hatchback with 295L, while opting for the sedan as tested here will well and truly solve the issue as it offers 444L.

The future isn’t cheap, and the new Mazda3 wasn’t a cheap car to begin with.

The new SkyActiv-X engine will be sold in just one trim level, the top-spec Astina, and will carry a $3000 premium over an identical car with the old naturally aspirated 2.5-litre ‘G25’ powertrain.

It makes for an MSRP of $41,590 in automatic form, as tested here. Mazda’s new premium push has compounded with the extra cost of the new engine to put the price dangerously close to premium car levels. A new BMW 1 Series, for example, can be had for $45,990.

It has to be said at this Astina grade, Mazda packs in the equipment. Standard fitment includes 18-inch 'gunmetal' alloy wheels, an 8.8-inch multimedia display (not a touchscreen) with Apple CarPlay and Android Auto support, built-in nav, digital radio, and Bluetooth connectivity, a slick Bose audio system, leather interior trim, full LED front lighting, heated auto-folding wing mirrors, push-start ignition, keyless entry, a sunroof, and a 360-degree top-down reversing camera.

There are some above and beyond additions, too, like a holographic head-up display, semi-digital dash, and a truly thorough safety suite. Alarmingly though, despite the electrical system overhaul, this Mazda is still missing advanced connectivity like USB-C and wireless charging. Seems like a petty complaint, but still one I’m going to make in the context of an over $40K hatchback.

The SkyActiv-X grade has a mild-hybrid system backed by a lithium ion battery which helps to power on-board auxiliary systems and "assist the engine." Unlike hybrid tech from Hyundai or Toyota, however, this system does not directly drive the wheels.

This is the clincher, really. The problem this car will face is being unable to take buyers away from hybrid Toyotas which are far more competitively priced, boasting even better fuel consumption.

The Mazda6 Atenza has a 2.5-litre four-cylinder turbo-petrol engine making 170kW and 420Nm. Only the GT and the Atenza have this engine, while the bottom two grades get a 2.5-litre without the turbo. What's the difference? A lot. The turbo engine makes 30kW and 169Nm more in power and torque. Two words to describe it: velvety smooth and powerful. OK that was three words, possibly four.

Shifting gears is a six-speed automatic transmission. Sure, other car makers are moving to more and more gears, but there's no fishing around for the right cog in this Mazda transmission, as you occasionally find in some eight- or 10-speed autos.

Here’s where it gets interesting. The SkyActiv-X X20 drivetrain is a 2.0-litre four-cylinder non-turbo petrol engine.

The trick? It blends the principles of spark plug ignition with that of diesel combustion ignition. Now to be clear, sparkless ignition would be the holy grail here, and that’s not quite what this engine does.

Mazda calls the tech spark-controlled compression ignition. It works by blending a lean mix of predominantly oxygen on the intake stroke in with a second injection of much richer fuel when the cylinder reaches close to its maximum compression. The spark plug then fires, and Mazda says this fuel mixture will then more fully combust thanks to the extra compression present.

According to Mazda at least, this means less wastage, more power, and cleaner emissions which are free of unburnt or partially burnt fuel.

Previous information had this engine feature a supercharger, and the brand's representatives confirm that some form of supercharging is present, however it is mainly "used as an air pump" for "ensuring an adequate supply of air is created" so that this new combustion cycle can take place.

Power has been boosted to 132kW/224Nm from the normal 2.0-litre’s 114kW/200Nm. Importantly, the peak torque figure arrives 1000rpm lower at just 2000rpm, getting close to the responsiveness of a turbo unit.

The SkyActiv-X is front-wheel drive only via an updated version of the brand’s six-speed torque converter automatic which is promised to be even more refined than its predecessor.

The new engine is also paired with a 24-volt mild-hybrid system which does not drive the wheels directly but assists the engine and auxiliary systems in the car.

We've written news stories about how Mazda refuses to bring hybrids or electric vehicles to Australia. Mazda's thinking is that its petrol engines are already super-efficient, and it says the 2.5-litre turbo petrol engine with the six-speed automatic in the Atenza wagon should use 7.0L/100km after a combination of open and urban roads.

I put more than 450km on the clock of the wagon but began fuel testing towards the end of our time with it to ensure a good combination of driving. My testing measured at the fuel pump found that after 144.3km our test car's mileage was 11.6L/100km. That was fully loaded up with a weekend away's worth of luggage for two adults and a five-year-old child on board.

You'll only need to feed it 91 RON, too.

All this new technology claims to cut 1.1-litres per 100km from the combined cycle fuel figure of an equivalent 2.5-litre Mazda3, down to a total of 5.5L/100km for the automatic (as tested).

Real world figures tell an interesting story. While my recent test of the 2.5-litre car produced a blow-out of 8.4L/100km, three days of driving the SkyActiv-X around in mixed conditions had it produce a much lower figure of 6.4L/100km.

So not only was the new engine more responsive, it was much closer to its claimed number on fuel, too. Emissions (often the real reason for advances in engine tech these days… ) have also dropped markedly from 152g/km of CO2 to 135g/km.

Interestingly, the SkyActiv-X engine requires 95 RON mid-grade unleaded petrol in Australia, contrary to previous information which suggested not only would the technology run on base 91, but it would actually run better.

Mazda says the 95 requirement is due to the high sulfur content of our entry-level fuel (a comment frustratingly echoed by other manufacturers), and it’s more a durability issue than one of octane. The brand’s representatives assured us 95 RON does not significantly affect the combustion ignition process.

As with all Mazda3s the SkyActiv-X has a 51 litre fuel tank.

You now know from what I've written above that the turbo-petrol engine and six-speed auto are excellent, but what's the Mazda6 Atenza wagon like to pilot? The answer is: outstanding, for the segment and price. Steering is excellent with good feedback, the ride is comfortable and composed and because this isn't an SUV, handling is impressive, with a low centre of mass.

That engine provides plenty of oomph for great acceleration and I know I've mentioned it already, but the transmission is also superb at holding gears for sporty driving or shifting almost seamlessly in the traffic and when cruising leisurely.

I wasn’t sure what to expect. How does a different injection method feel?

After three days behind the wheel I can confidently say most people won’t really be able to tell the difference, but that’s not to say there isn’t one.

Quite the opposite in fact. This new engine’s bump in power and more readily available peak torque are notable.

I spent most of my drive time with the energy monitor screen set, so I could try to understand how this new engine reacted to my inputs. The combustion ignition (SPCCI) mode is working most of the time. It doesn’t run at idle, and Mazda says it won’t run at ‘high loads’, but it seems to always be on past about 1200rpm in normal driving.

Once it reaches that point, the revs surge up quickly, almost like a turbocharged engine. It’s not quite as full-on with its surge of power, but it is very noticeable.

It gives this car a kind of comfortable pulling power kick which is at least on-par, but probably better, than the equivalent 2.5-litre engine (without being able to test them side-by-side), despite its higher power figures.

I wish I could tell you there was some big ‘wow factor’ moment here. Like it sounds really great once it’s on song, or it has a snapping-on feeling like Honda’s once-lauded VTEC. But it doesn’t. This engine has a unique tone, sure, but it’s quiet and subtle, and the delivery of power is quite linear.

In fact, the whole drive is notably smooth and refined. A cut above the rest of the Mazda3 range. The engine sounds distant, even when pushed, and the transmission has been smoothed out further between gears and re-calibrated to better deal with the new powerplant’s readily available bump in power.

As always, Mazda’s 'i-Stop' stop/start technology is one of the best on the market, to the point where you won’t even notice it’s there. The efficiency of this system has apparently been given a boost by the new 24V hybrid system, but again, there’s little tangible difference in terms of how it feels.

The energy monitor really made me wish this car was just a traditional hybrid. I don’t doubt whatever comes next will be. it would be a truly fantastic step forward to blend the benefits of this engine with a true hybrid drive for even lower consumption.

The drive experience imparts a sense the SkyActiv-X simply does what it claims to do. It’s a shame there’s nothing particularly exciting for driving enthusiasts (apart from how cool the tech is), but it really lives Mazda’s current ethos of constantly tweaking and improving what it has to work with, without any radical changes to what consumers expect behind the wheel.

The same excellent suite of active safety items available on other Mazda3 Astina variants is offered here, meaning freeway-speed auto emergency braking (AEB), reverse AEB, lane keep assist with lane departure warning, blind spot monitoring, rear AND front cross traffic alert (uses sensors to see around objects which might block your view when pulling out), traffic sign recognition, as well as adaptive cruise control with stop and go function.

On the expected side of things there are seven airbags, the expected brake, stability, and traction controls, as well as dual ISOFIX and three top-tether child seat mounting points across the rear seat.

Unsurprisingly, the Mazda3 carries a maximum five-star ANCAP safety rating as of 2019.

The Mazda6 Atenza wagon is covered by a five-year, unlimited-kilometre warranty. Servicing is recommended every 10,000km or 12 months and you can expect to pay $324 for each of the first five services.

All Mazda3s, including this new variant, carry a five-year, unlimited kilometre warranty promise competitive with competitor marques, including five years of roadside assist.

Service pricing was not available at the time of launch, although Mazda told us it shouldn’t stray far from the current 2.5-litre engine option which costs between $315 and $359 on alternating years for the life of the warranty.

Service intervals should also remain the same at 10,000km or 12 months whichever occurs first.