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So, just how different are the Fiat 124 Spider and Mazda MX-5 Miata?

"We leveraged a great platform." That's how Bob Broderdorf, Jr., Fiat's North American director, summarizes the creation of the 124 Spider. We all know Fiat's new roadster shares its underpinnings with the fourth-generation Mazda MX-5 Miata, but there are a lot of key differences to keep them separate in the eyes of consumers. Mazda may have engineered the platform, but Fiat added many of its own touches. Here, we'll take a closer look at the spec sheets of the two cars, and summarize the major differences between the Japanese and Italian roadsters. If you need a refresher, read our full First Drive of the 2016 MX-5 Miata, and glance at all the Fiat 124 Spider details in this post. Design Fiat Chrysler design lead Ralph Gilles is super excited about this car. "I think it's going to change lives," he told the assembled media at an event in Auburn Hills, MI, earlier this month. Yes, it's definitely exciting to add a small roadster to any lineup, especially one that uses such a proven platform. But we're not sure people are going to get all that jazzed about it from a design standpoint. You'll either love it or hate it, and we're kind of leaning toward the latter. Every single body panel is new, and the design is "100 percent Italian." There are a number of creases and angles throughout the exterior, with a squared-off rear end and rectangular taillamps. Fiat trusts you'll be able to spot the similarities between the new 124 Spider and the original, but we're not so sure. We can see a bit of the old car's grille on the new car's face, and the dual hood blisters are a nice throwback touch, but that's about it. Trust us when we say that this car looks way better in photos. In person, it really didn't wow us. Of course, beauty is in the eye of the beholder. One colleague told us his wife, a long-time Miata owner, hates the look of the new one but will absolutely adore the Fiat. Good for her, and good for Fiat. But based on design alone, we'll take the Mazda every single time. What about you? Dimensions When Broderdorf said Fiat leveraged the Miata's platform, that means the Italians took it as-is. The two cars ride on an identical, 90.9-inch wheelbase. The front and rear tracks lengths are the same, at 58.9 and 59.1 inches, respectively. But that's where the similarities end.

Mazda RX-3 restomod makes Leno scream, us cheer

The Mazda RX-3 Savanna was the rotary-engined version of the Mazda 808 Grand Familia. Sold in the US from 1971 to 1978, the little Japanese fastback earned a reputation as an excellent racecar, winning events all over the world. A racing connection is how a fantastic 1973 restomod example owned by Savant Young made its way to Jay Leno's Garage. Young said that when he was a boy his uncle used to street race an RX-3, and Young liked how the RX-3 sounded and the fact that a tiny import could go up against and beat big V8s of the time. Leno admitted that he has no connection to the RX-3, saying it's not the kind of car he typically likes. But he liked Young's custom update so much that when he saw the coupe sitting outside the Petersen Museum in Los Angeles, he waited for the owner to show up. Young's changes over the 15 years he's owned the car include dropping in the rotary engine and running gear from the second-generation Mazda RX-7, bridge-ported and methane injected. At 15 pounds of boost he says it's putting out about 400 horsepower. The rear end comes from a Toyota Hilux half-ton pickup, to help put all that power down in a car that weighs maybe 2,100 pounds. The color is taken from the Lamborghini palette. Disc brakes all around, 14-inchers up front, control the velocity. Nothing controls the gas mileage, said to be "maybe 12 mpg." And nothing could stop Leno from whooping it up during the driver. Check out the fun in the video above.

Japan plans real-world diesel emissions test after companies fail

Japan's transport ministry plans to start real-world diesel emissions tests after an experiment found four models from Toyota, Nissan, and Mitsubishi that produced more nitrogen oxide (NOx) emissions than the nation's rules allow, according to The Japan Times. Regulators there usually only perform emissions checks in the lab. The VW diesel scandal has everyone double-checking their figures. Diesel versions of the Toyota Hiace van, Land Cruiser Prado, and Nissan X-Trail produced up to 10 times more NOx than allowed. The Mitsubishi Delica D:5 was up to five times over the limit, The Wall Street Journal reports. There was no evidence of defeat devices in the vehicles. Mazda performed well in the experiment, though. The CX-5 passed with nearly the same results on the road and in the lab. The Demio, better known as the Mazda2, did nearly as well with only slighter higher figures in the real world than in the controlled setting. The experimenters theorized the reason for the excessive emissions was that cold weather caused the engines' software to shut off the exhaust gas recirculation to prevent damage, according to the WSJ. However, this behavior also increased NOx production. Toyota, Nissan, and Mitsubishi don't have to worry about punishment from the transport ministry because this check was just an experiment. Their models already passed the mandated lab tests, which was the only requirement, according to The Japan Times. As governments begin greater real-world emissions tests, the results suggests diesels aren't very clean. A recent check in France found models from Ford, Renault, and Mercedes-Benz that didn't perform up to the standards. Regulators in India conducted similar evaluations and ordered VW to recall over 300,000 vehicles. Related Video: