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Mazda Skyactiv-X Review | The revolution begins with a squeeze-bang

The matte black Skyactiv-X prototype looks like a rough Mazda3, perhaps reconstructed after a bad wreck by an over-enthusiastic owner of a spot welder and lots of gaffers' tape. Ribbed ducts poke out of the dash sending two breaths of conditioned air to no one in particular. Even its revolutionary engine, the thing we're here to experience, is entombed in a massive, nondescript cover to mask its unseemly noises. It's a wild, strange way to meet a very unconventional vehicle that promises diesel-like fuel economy, a wide torque band, and an exotic method for burning less gas than ever before. It takes a few hours for Mazda's engineers to explain the fundamental principles of operation. For more detail, read our Skyactiv-X Spark Controlled Compression Ignition explainer, but here's a very brief overview. Skyactiv-X marries some traditional gasoline engine characteristics with a novel form of compression ignition called SPCCI. The key for Skyactiv-X is to use very high compression in the cylinder and an extremely lean fuel-air mixture. Squeezed right to the cusp of getting hot enough to blow up all on its own (which is very hard to predict), a squirt of extra gas and a spark interject to cross that compression-ignition threshold in a controlled and predictable manner. See the animation below: That takes a few essential components to get just right. One is a massive amount of computer processing power and some pressure sensors in the individual cylinders, because the ambient conditions change how and when these things happen. Skyactiv-X uses a clutched supercharger to pump in additional air when needed to nail the mixture precisely, and high-pressure injectors to get the low ratios of fuel to disperse properly in the chamber. And since it operates like a conventional gasoline engine sometimes, it uses valve timing to lower the very high compression ratio so it doesn't reach combustion ignition in that mode. In practice, the Skyactiv-X runs in compression ignition mode most of the time. In practical terms, that means it drives like a torquey gasoline Skyactiv engine. The torque curve is broad and flat — diesel-like in that respect. That also means it can get away with using a six-speed transmission and a lower final drive for better response. There's enough grunt and economy together that Mazda can let the engine spin faster — at 60 mph, it's running at roughly 1,000 more RPM than a similar gas engine, with greater efficiency.

More powerful 2019 Mazda MX-5 also more efficient

Bumping the 2019 Mazda MX-5 Miata's power from 155 horses to 181, plus little interior upgrades such as a telescoping steering wheel were more than enough to make the appealing roadster even more so. But there's yet another bonus in store for those that pick up the new Mazda: more efficiency. As initially spotted by industry watcher Bozi Tatarevic, the EPA released fuel economy numbers for the new model, and they're better than the 2018's. And between the automatic and manual versions, the manual sees the biggest increase. Now, these are, very, very minor increases in EPA fuel economy, but any increase is welcome when nothing is lost. The automatic continues to be the most efficient. While the city and highway ratings are unchanged at 26 and 35 mpg respectively, the combined rating increases by 1 mile per gallon to 30. The manual transmission model isn't far behind. City mileage stays the same at 26 mpg, as does the combined rating of 29 mpg. However, highway fuel economy picks up 1 mpg for a total of 34. So to recap, the 2019 Miata retains its good looks, and likely its playful handling and snickety shifter. But it also gets more power, better fuel economy, a better interior, and more options to customize than ever before. This is sounding like it could be the best Miata, yet. We can't wait to try it out. Related Video: Mazda Convertible Performance

2016 Mazda MX-5 Miata in motion for the first time

By now, you've already poured over the details (however few there may be) and images of the 2016 Mazda MX-5 Miata. For us enthusiasts, it's arguably the most important new car debut of the year, and for Mazda, it marks the 25th anniversary of its iconic roadster - something that's being celebrated all weekend long out in Monterey, CA.
Our resident Miata owner, Chris Paukert, is out in sunny California and just passed along this video, showing all four generations of the MX-5 in motion (slowly), on the road at Mazda Raceway Laguna Seca. This is the first time the 2016 MX-5 has been shown driving under its own power, and it will join a wealth of other roadsters as Mazda attempts to break the world record for most Miatas in one place at one time.
Have a look at the emailed-from-an-iPhone-quality video above, and then take a moment to read Paukert's own notes from the ND Miata's live showing earlier this week, here.