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Check out the trick way you access the tire valve on this BMW Alpina B6

The wheels are one of the first things you notice when checking out the 2015 BMW Alpina B6 xDrive Gran Coupe. The 20-inch aluminum alloy rollers have 21 spokes that spray out from their hubs, creating one of Alpina's signature design features. But there's also plenty of function to go along with the stylistic form of this hotted-up BMW 6 Series Gran Coupe.
By rotating the Alpina roundel and unlocking the center hub, you gain access to the tire valve and bolts, which are hidden inside. They're literally kept under lock and key, and they protect your Alpina's wheels from the elements and theft. This unique center-fill system employing a hollow spoke isn't a new setup for the favored BMW tuner, but since Autoblog had one in our offices this week, we thought we'd take the opportunity to show the unique mechanism in case you haven't seen it before. Check it out in our brief video below.

Recharge Wrap-up: Tesla opens 50th European Supercharger, BMW smart charging in Singapore

Southeastern Illinois College wants to create a biofuel processing certification program. The school is waiting to hear about receiving $750,000 from a US Department of Labor grant that would allow it to expand its Biofuels Education curriculum to include certification for manufacturing biodiesel and ethanol. There are currently no such programs in existence, and its development would require Labor Department approval as well as input from biofuel companies. Southeastern Illinois College believes that biofuel processing certification would be a large draw for potential students. Read more at The Southern Illinoisan. Tesla has opened the 50th Supercharger in Europe. In the year since the first on was installed in Norway in August 2013, Tesla has been building the network that, like it does in the US, will allow Model S drivers to go long distances for free. There are now 168 Superchargers open throughout the world. Find more in the press release below. BMW is partnering with Greenlots to bring an open standards EV charging network to Singapore. As part of BMW's 360 Electric program, Greenlots will install public chargers and manage the network that allows BMW i owners to find and use the chargers with BMW's navigation system and ChargeNow card. The 30 possible public chargers Greenlots plans to install will use the company's SKY Smart Charging platform. Greenlots will also install the BMW i Wallbox Pure charger at customer's homes and offices. Read more in the press release below. Plug-in electric vehicle (PEV) sales are forecast to reach 1.8 million a year by 2023, according to a report by Navigant Research. Right now, North America is the biggest buyer of battery-electric and plug-in hybrid vehicles, but that should change as the Asia Pacific market is expected to outgrow it; still, the US alone is expected to have more than 2.7 million PEVs on the road in 2023. Urban areas are where we'll see the largest concentration, naturally, with Tokyo, Los Angeles and Paris having the most sales in 2023, respectively. With the increase in PEVs comes an increase in residential load on the electric grid, which is expected to rise by 33 to 37 percent. Read more at Hybrid Cars, or head to the Navigant Research website. Chinese automaker Dongfeng is now manufacturing its first mass-produced electric vehicle, the Aeolus E30. The small, two-seat urban EV has a limited speed of 50 miles per hour, but has a range of up to 100 miles.

Automakers' sound systems: Crank it, don't yank it

Years ago, one of the first things most music lovers did after buying a new vehicle was drive to an aftermarket stereo shop to get the crappy stock components swapped for better gear. And you'd typically get not only better sound but also more bang (and boom) for your buck. But in the past decade or so, the overall quality of OEM audio has dramatically increased, while car electronics became more complex, removing the incentive for most new vehicle owners — and all but the most hardcore DIYer — to start from scratch. In 2010, I did a comparison of the average costs for OEM electronics vs. similar offerings from the aftermarket, and back then automakers' stock premium systems were by far the best bargain — and are probably an even better value now. The premium 14-speaker, 1,200-watt JBL system in the all-new 2019 Toyota Avalon is a prime example of this trend. It's standard on the top two Limited and Touring trims and is available as a $680 audio upgrade on the XLE and XSE. I doubt you can even buy 14 speakers and 1,200 watts of amplification from the aftermarket for 700 bucks, much less have it all installed. And because the system is bundled with Toyota's Entune infotainment system, Apple CarPlay and a surround-view camera, removing the head unit means you would likely lose these features. Another advantage of OEMs and their audio partners is they can design the car around the audio system. In the past, automakers would typically place speakers where convenient for packaging, not for optimal sound reproduction, and audio engineers were forced to compromise. But as with the Avalon's premium JBL audio system, this is starting to change. At a recent behind-the-scenes peek for media into the process of developing the system, Toyota and Harman engineers delved into the minutia of sealing the inner panel of the front doors to create an enclosure for 6x8-inch woofers, making space in the pillars for JBL horn tweeters and extensively measuring the acoustic properties of the interior to tune the sound to the space. I'm met some creative and skilled car stereo installers, but none with a degree in psychoacoustics. The system is also the first to feature Quantum Logic Surround that creates a multi-channel listening experience from two-channel sources. And it includes Harman's Clari-Fi processing that "rebuilds key details lost" in compressed audio formats used by streaming music services and MP3s.