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This is what a 1,200-hp twin-turbo 4-rotor looks like in a Miata

We've seen the diminutive Mazda MX-5 Miata swallow plenty of big engines, but New Zealand drifting ace "Mad Mike" Whiddett is roaring into where-no-man-has-gone-before territory. Wanting to replace his 515-horsepower "MADBUL" RX-7 and its twin-turbocharged, three-rotor 20B engine, his new ride is an NC-series Miata with four rotors and twin Garrett turbochargers courtesy of Pulse Performance Race Engineering. It is called "RADBUL," and expected power at standard boost is 1,200 hp, but the builders at Pulse Performance think it will get up to 1,500 hp at full boost. And yes, that exhaust exits through the hood. Four-rotor engines are actually popular - builds are detailed on forums like this one from 2007 and this one from 2008, this UK company or this Canadian company will sell you one complete - but they're usually being prepped for an RX-7. Mad Mike's choice of a Miata for this enterprise makes this about as extreme as you can get, short of throwing it into a Mazda R360. You can watch Mad Mike tell the story of the build in the video, and check out the first and second installments about the build on the Red Bull site.

The spirit of these 7 weird Mazdas lives on in today's cars

HIROSHIMA, Japan — When visiting the Mazda Museum in Hiroshima, housed amidst the company's main manufacturing site on the shore of the Enko River, you can follow Jujiro Matsuda's early 20th century entrepreneurial path from artificial cork manufacturer to machine and machine toolmaker, to motor vehicle producer. But probe a bit deeper into the exhibits, and you can uncover more than just a chronicle of corporate achievements: delightfully weird outliers, paragons of oddball design, engineering and marketing solutions It's looking at these delightful misfits that really illustrates Mazda's tale. You can also see precisely how many of these vintage conveyances led directly (or indirectly, or obtusely) to Mazda's most iconic American-market cars and trucks. Our seven favorite precursors, and their lovable successors, are listed below. 1931 Type TCS/Mazda B-Series Mazda's first vehicle was this little three-wheeler, powered by an air-cooled, one-cylinder motor. Because the company lacked a distribution network at the time, the trucklet was marketed by Mitsubishi; hence the three-diamond pattern on its side. All of this is very reminiscent of the company's eventual foray into the U.S. market, where its sales were spearheaded by compact pickups. The B-Series, which was one of the first Mazda vehicles available in the U.S., arrived in 1972, and stuck around through the first decade of the 21st century. Like its partnership with Mitsubishi, Mazda teamed up with stakeholder Ford to market this little truck as Ford's first small pickup, the Courier, the precursor to the Ranger. There was even a rotary-powered B-Series for a few years, but we're getting ahead of ourselves. 1968 Bongo Van/Mazda5 The Bongo allegedly was the first one-box van design in Japan, and apparently it was so popular that the name Bongo became, for a period of time, the generic metonym for the category—the way that Kleenex is a stand-in for all facial tissue. With a tiny rear-mounted engine and a planar expanse of metal to push around, it was not particularly fast, but it was both spacious and innovative. The same could be said of the brand's mini-minivan, the Mazda5, which was available for a couple of generations in the States in the Aughties. Sadly, the name 5 never caught on as a synonym for fun-to-drive family hauler, at least not yet, and the category itself (like nearly every other car category) was crushed in America by the rise of the crossover.

Recharge Wrap-up: 61 miles on Autopilot; Mazda CX-9's 32% mpg improvement

A technology analyst at The Motley Fool used Tesla's Autopilot uninterrupted for 61 miles. In order to see how far the Tesla Model S could drive itself without driver intervention, Daniel Sparks set off on the highway from Monument, Colorado, through Colorado Springs and onward toward Pueblo. Only when a truck encroached on his lane did the driver take command of the wheel, rather than waiting to see what the car would do. "With [the] Model S nearly out of Pueblo and onto a long, boring stretch of highway by the time I had to grab the wheel, chances are I could have made it all the way to Colorado City if it wasn't for this interruption," says Sparks. Read the full account at The Motley Fool. The 2016 Mazda CX-9 offers 32 percent better fuel economy than the outgoing model. The front-wheel-drive CX-9, equipped with Mazda's Skyactiv-G 2.5T engine, gets an EPA-estimated 22 mpg city/28 mpg highway/25 mpg combined. The 2016 CX-9 has shed significant weight compared to its predecessor. Its turbocharged engine uses a Dynamic Pressure Turbo system, which improves performance at lower rpm by controlling the degree of exhaust pulsation according to engine speed. The new CX-9 goes on sale this spring. Read more at Green Car Congress. A group of eight US cities have formed the Energy Secure Cities Coalition (ESCC), pledging to switch their fleets over to alternative fuels. Atlanta, Charlotte, Indianapolis, Orlando, Rochester, Sacramento, San Diego and West Palm Beach will retire their petroleum-powered vehicles in favor of EVs and cars using cleaner fuels like natural gas. The cities expect the change to help improve air quality and save taxpayer money on fuel and maintenance costs. The ESCC hopes to grow to include 25 major cities, removing some 50,000 petroleum-fueled vehicles from service and saving 500,000 barrels of oil per year. Read more in the press release below. Eight Major Cities Unite to form Energy Secure Cities Coalition—Fleets Embracing Alternative Fuels to Improve America's National and Economic Security Coalition's goal is to retire 50,000 petroleum-powered vehicles, saving tens of millions in taxpayer dollars and improving U.S. national and economic security. Washington, D.C.