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Mazda's next-gen SkyActiv engines will drop spark plugs in favor of high compression

Homogeneous charge compression ignition, or HCCI, is the black art of internal combustion engines that aims to produce diesel-like fuel efficiency for the cost of gasoline. Although some of its competitors have developed and subsequently given up on the tech, Mazda confirmed that the next-generation of SkyActiv engines will employ HCCI technology, improving fuel economy by 30 percent and at the same time reducing exhaust emissions. According to Nikkei, a new SkyActiv family of engines is set to debut under the hood of the next-gen Mazda3 sometime in 2018 before making its way into other vehicles. In simple terms, an engine that uses HCCI burns the air/fuel mix using pressure instead of with spark plugs, just like a diesel. At 14:1, Mazda's gasoline engines already have some of the highest compression ratios out there, but a move to HCCI means cranking up the compression to 18:1. While the tech sounds relatively straightforward, using HCCI means dealing with a number of side issues. It's one of those "on paper" ideas that compounds problems when put into practice. Heat, revs, and fuel must all be carefully managed as gasoline doesn't burn the same way as diesel. Mazda is mum on details, but the automaker seems confident that the issues have been sorted. If the new engines do indeed make it to market with HCCI, Mazda will have out-engineered GM, Daimler, and Hyundai, all of which have tried and failed to develop HCCI engines in a cost-effective package. With the market moving towards electrification, it's interesting to see Mazda still focusing so heavily on traditional internal combustion gasoline engines. It's an indication of where they see the market heading for the next few years. Although the automaker has been hesitant to move forward with hybrid and electric powertrains, Nikkei also reports that Mazda will begin mass production of EVs in 2019. Related Video:

2015 Mazda3 interior spied for the first time

In terms of exterior appearance, not much has changed from the last time we spotted the next-generation Mazda3 out testing. Oh, sure - we can see plenty of details that clearly show the new Kodo design influence (that front end reminds us a whole lot of the sleek new Mazda6), but these latest round of spy shots don't really show us anything we haven't seen before. Oh, wait, yes they do - the interior.
Feast your eyes on the Mazda3's insides, showing a vastly reworked interior that also takes cues from the automaker's most recently refreshed products. We can see that there's a simple, clean center stack with a slim row of heating and cooling functions, and up top there's a large, presumably touchscreen display, with redundant controls found just aft of the shifter.
We expect that the 2015 Mazda3 will debut at the Frankfurt Motor Show this September, packing both petrol and diesel engines. A sedan variant is also in the works, and should debut shortly after the hatchback.

Midsize Sedan Comparison | Honda Accord vs. Toyota Camry vs. Mazda6

The rumors of the midsize sedan's death have been greatly exaggerated. The 2018 Honda Accord and 2018 Toyota Camry together moved more than 262,000 units through May of this year, which is still a ton of cars. Then again, both are down year-over-year despite being completely, and quite impressively, redesigned for 2018. So yes, the midsize sedan's grip on family transportation is weakening. Ford certainly thinks so, yet this change in consumer preferences comes at a time when the current crop of sedans is sensational. They're bigger and more powerful, yet also more efficient. Safety scores are impeccable. They even look better than ever. So before running out to score one of the bajillion little SUVs flooding the market, why not ponder this trio of midsize sedan all-stars that might actually work better? Over the course of three consecutive weeks we tested the 2018 Camry XSE V6, 2018 Accord Touring 2.0T and the perennial critical-darling 2018 Mazda6 Signature. The latter was thoroughly overhauled and, perhaps as such, bucked the segment trend by actually selling more in June this year. Each was a range-topping trim level with all the bells and whistles, plus the most powerful engine available. Really, you couldn't find cars closer in power, price and feature content. View 57 Photos Performance and fuel economy Toyota bucked the turbocharged trend by sticking with naturally aspirated engines for the 2018 Camry, and when it comes to its 3.5-liter V6, it's sure hard to argue with that decision. For starters, it produces 301 horsepower. Let that sink in for a moment. A 301-hp Toyota Camry. That crushes the others, while its 267 pound-feet of torque is only 6 less than the Accord. This is a strong, smooth engine that only gets better when you realize it matches the 26-mpg combined fuel economy of the others. Honda, meanwhile, followed the masses by switching to a turbocharged four-cylinder for the Accord's engine upgrade (and its base engine, for that matter). Though its 252 hp is considerably down on the Camry and its 271 lb-ft is only a smidgen more, the Accord's torque arrives earlier in the rev range without feeling overtly turbocharged. It also has 143 fewer pounds to contend with. When wrung out, this new 2.0-liter belts out a beautiful, typically Honda song made possible by the smart 10-speed automatic (the base 1.5-liter is paired to a CVT that results in more drone than mechanical music) that thankfully doesn't draw much attention to itself.