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16Citroen C4 Cactus Airflow 2L promises 141 mpg, no door dings [w/video]

I'm the president of Autoblog's chapter of the Citroën C4 Cactus Appreciation Club. Full Disclosure: I'm also probably its only member. Why am I fan, you ask? Because the C4 and its ding-resistant Airbumps offer the versatility of a five-door Ford Focus, but it's 350 pounds lighter than today's Mazda MX-5 Miata, tipping the scales at just over 2,100 pounds. And when equipped with a diesel, it returns 91.1 miles per gallon (European), all while looking like the epitome of French quirkiness a

67Which is more fuel efficient, driving with a pickup's tailgate up or down?

We Find Out With A 2015 Ford F-150, A Wind Tunnel And A Smoke Wand

Thanks to the smoke wand in the wind tunnel, you can actually see the difference in our video.

20Looking back at the Citation IV concept that likely shaped the GM EV1

How Chevy's Time In The Wind Tunnel Taught GM An Aero Lesson

Those who forget history are condemned to repeat it. We're not sure how that applies to the GM EV1, but we'd still like to share something from Autoline Daily, an online automotive new show with our friend John McElroy. He's been covering the business for decades now and recently found something interesting: pictures of the 1984 Chevrolet Citation IV concept, seen above.

25How Ford made its 2015 Ford Mustang safer for toupee wearers [w/video]

Ford is ready to tell the story of its 2015 Mustang Convertible, the can't-miss bits being the easier, quicker and quieter roof operation, a more robust roof build for a coupe-like cabin noise, more trunk space, better visibility and reduced in-cabin buffeting. The top release system has been completely redesigned with a single, center-mounted latch on the windshield frame instead of the dual latches of before. The driver can now release the roof without having to lean over into the passenger sp

10McLaren P1 program director gives an aero walkaround

Evo magazine recently got McLaren P1 program director Paul Mackenzie to reveal some of the aerodynamic and materials details that help make his new hybrid supercar so stupendous. The walkaround makes sense of the numerous intersecting lines and angles on the P1, like the main intakes placed inside the doors, the vents just ahead of the front wheels that were added later in road testing to get more cooling to the radiators, the vents on the rear to cool the clutches and the titanium-mesh chimney

7Chevy comes up with Volt mirror modification to stop wind thumping

If you're getting annoyed by a 'thumping' noise caused by driving your Chevy Volt with the windows down, there is a fix kit available. One Volt owner in San Diego, CA, was pleased to have the problem solved, allowing him to go back to being a "fresh air fanatic."

20See how the McLaren P1 was 'Designed by Air'

In attempt to visualize the claim that the McLaren P1 is, "The most aerodynamically advanced car in the world," the Woking, UK firm has put out a video called Designed by Air to show how the stuff we breathe interacts with the supercar.

39SAE Congress: Evolve Hybrid Wheels give Ford Focus SE a 1.1 mpg boost

As fuel economy regulations tighten all around the world, each part of the automobile is getting a second (and third and fourth ...) look to see if there is any way to squeeze out a few more yards per gallon. At the SAE World Congress in Detroit this week, Lacks Enterprises was showing off its contribution to the get-every-efficiency debate: Evolve Hybrid Wheels.

18Sim-CEL has Tesla-quick performance, lasers for high beams

Sim-Drive continues to move towards its goal of evolving the gloriously fantastical all-electric eight-wheeled Eliica into a mass-produced passenger vehicle by 2015. Introducing the SIM-CEL (Cool Energy Link), the third iteration in the Sim series of prototypes.

362014 Mercedes-Benz CLA-Class will be the world's most aerodynamic series production vehicle

It may not look it, but the 2014 Mercedes-Benz CLA-Class is aerodynamic as all get out. How slippery is it? Well, the compact sedan has a drag coefficient of 0.23, which will make it the world's most aerodynamic series production car when it goes on sale in the US this September. By comparison, the most recent body update for the Toyota Prius cut the drag coefficient of that hybrid model to 0.25 from 0.26, while the 2013 Nissan Leaf electric vehicle has a 0.28 drag coefficient, down from 0.29 fo

15Toyota shows off RAV4 EV's eco tricks with new videos

If a picture paints a thousand words, Toyota's hoping that a couple videos do a little better than that for its RAV4 Electric Vehicle.

13Mini shows Cooper Works GP goes for a smoke, cheats the wind

Mini wants you to know all about its latest, limited-to-2,000 John Cooper Works GP edition. After a stint at the 'Ring to set a time of 8:23, the two-seat-only Cooper has parked itself in the wind tunnel to demonstrate its various wind-cheating features like the engine shield and rear wing.

602015 Toyota Prius rumors start flowing

Toyota has already picked the low-hanging fruit when it comes to boosting the Prius hybrid's fuel economy. But the Japanese automaker's planning on climbing a little further up that tree.

8New Petersen Museum exhibit features early 'aerodynamic' cars

Los Angeles's Petersen Automotive Museum this week will debut an exhibit dedicated to early versions of what were thought to be aerodynamic cars, the New York Times reports. The cars may not have cut the wind as well as the designers intended, but some of them sure were beautiful.

25MotoCzysz reveals 2012 E1pc with Kardashian-inspired butt

We are astonished. No, not because Team Segway MotoCzysz has just revealed its 2012 version of the E1pc and it looks pretty amazing. We expected that. Rather, we are somewhat stunned that the cultural impact of certain aspects of Kim and Khloe Kardashian's um, prominent physical attributes has just expanded into the geeky green world of electric motorcycle racing. More on that in a moment.

51Why wheel spats probably won't make a comeback despite aero benefits

Sad news if you were hoping to see fender skirts return to the automotive design mainstream; according to Automotive News, General Motors has already spent a fair chunk of time and money investigating whether or not adding the aero pieces could lead to increased fuel economy.

AddIn Detail: Aerodynamic Testing In GM's Wind Tunnel

This week's episode of TRANSLOGIC features Suzy Cody, a GM Aerodynamic Development Engineer who also happens to have blue hair and participate in a Roller Derby league. When not lacing 'em up as "Shovey Camaro," Cody is working diligently on improving the fuel economy of vehicles in the wind tunnel at the GM Tech Center. Basically, aerodynamic efficiency boils down to one metric: drag coefficient (Cd). This is the measurement of how drag force impacts a vehicle's ability to efficiently travel t

16BMI's simple aero tweaks could increase semi truck efficiency by 12%

South Carolina-based BMI Corporation and the Department of Energy's Oak Ridge National Laboratory have developed a simple set of aerodynamic fairings that reduce fuel consumption of long-haul semi trucks by up to 12 percent. The aerospace-inspired add-ons, which BMI calls the SmartTruck UnderTray System, include five individual components that work in harmony to reduce the drag coefficient of tractor trailers. Specifically, the aero add-ons reduce the low pressure area that forms behind a truck.

14Aerodynamic add-ons reduce fuel consumption of semi trucks by 7-12%

BMI Corporation, along with the Department of Energy's Oak Ridge National Laboratory, have developed a set of aerodynamic fairings that are claimed to reduce fuel consumption of long-haul semi trucks by 7-12 percent. The aerodynamic add-ons, which BMI calls the SmartTruck UnderTray System, include five individual components that reduce the drag coefficient of tractor trailers.

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