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Why it's difficult to accurately test the efficiency of a plug-in car

When it comes to electric vehicles and plug-ins in general, the Environmental Protection Agency-certified range is a hugely important number. While actual range anxiety is largely psychological, the magic number does provide a point of comparison of buyers considering one EV over another. The driving distance is also often touted by automakers when marketing their models. Unfortunately, as Green Car Reports finds in a recent deep dive, the way the EPA calculates the figure is a convoluted mess, and discovering the reasons why is definitely worth the read. The issue isn't about bad science but instead comes down to vague wording. The EPA's accepted range test is sourced from an evaluation called J-1634 from the Society of Automotive Engineers, and it seems to provide balanced results for vehicles that automatically reach a single state of charge when plugged in. However for models with multiple charge settings, the situation gets complicated very quickly. Of course, these modes are often created in the software, meaning that a car's certified driving distance can change with just a few taps of the keyboard without the real world results owners might experience actually changing. By showing the test's effects on the certified range for the Tesla Model S, Nissan Leaf and Mercedes-Benz B-Class Electric Drive over the last few years, Green Car Reports makes a compelling argument that it's the evaluation that needs to change. Thankfully, it appears that the solution is a very simple one. Get the details here.

First Mercedes B-Class Electric Drive rolls off line, coming to US soon

Mercedes-Benz is about to give Americans another choice of battery-powered vehicle. Offering more all-electric range than the Nissan Leaf or BMW i3, and with a smaller price tag than the Tesla Model S, the B-Class Electric Drive is officially set to arrive in the US this summer. Indeed, the first examples have begun rolling off the production line in Rastatt, Germany. Featuring drivetrain parts from Tesla Motors, the luxury compact hits all the performance parameters mentioned during its debut at last year's New York Auto Show. For a refresher, that's a single-charge range of 200 kilometers (124 miles) along with a 0-to-100 kilometer-per-hour (62 mile-per-hour) sprint in a respectable 7.9 seconds. These achievements comes courtesy of a 28-kWh lithium battery located in the floor of the passenger compartment and a 132-kW (177-horsepower) motor powering the front wheels. Torque specs for the unit seemed to have increased somewhat and are now given as 340 Newton meters (250.77 pound-feet). It boasts an 11-kW charger and can add as much as 62 miles of range to a deleted battery in an hour and a half. Sadly, it is not Supercharger compatible. The B-Class Electric Drive, which is built on the same production line as the gasoline-powered version, is going to go on sale in Europe around the end of the year and will also come in a right-hand drive version for other markets in 2015. Although pricing has not yet been announced, Mercedes execs expect it to be quite competitive with the BMW i3. Scroll below for the press release (Google translated from German). Model offensive: Mercedes-Benz launches first major series for electric cars - the start of production at Mercedes-Benz in Rastatt: B-Class Electric Drive begins For the first time large-scale production of Mercedes-Benz models with internal combustion engine and electric drive on the same line Stefan Abraham: "With the B-Class Electric Drive we are expanding our production portfolio at the Rastatt plant is a highly innovative drive variant." In the Mercedes-Benz plant in Rastatt today through the first B-Class Electric Drive off the line. This makes Mercedes-Benz models are produced with internal combustion engine and electric drive on the same line at the site for the first time. The B-Class Electric Drive is based on the Mercedes-Benz front-wheel drive architecture of the new Mercedes-Benz compact car generation and uses the modular component kit.

Lewis Hamilton wins British GP, slashes Vettel's lead to 1 point

SILVERSTONE, England - Lewis Hamilton won his home British Grand Prix for the fourth year in a row on Sunday, while a penultimate-lap puncture slashed Sebastian Vettel's championship lead to a single point. The Briton's drive from pole to flag on an overcast afternoon was lonely, uneventful and dominant - in complete contrast to his Ferrari rival's afternoon - with Mercedes teammate Valtteri Bottas finishing 14 seconds behind to secure the one-two. "The support has been incredible this weekend. I am so proud I could do this for you all," said Hamilton, who threw himself into the fans for some crowd surfing after the podium celebrations. "The team were faultless this weekend, Valtteri did an incredible job as well, so it's the perfect weekend for us." Far behind in his wake, as Hamilton cruised to a 57th career win and soaked up the applause from an army of flag-waving fans, came sudden drama. Vettel, who had battled on worn tires but looked like securing the final podium position until the blowout, finished seventh after an emergency pit stop with a shower of sparks from the wheel rim. "There was no sign of that happening," said Vettel over the team radio. "There were vibrations but I had it for 20 laps and it didn't get massively worse. The tires didn't look great but they never look great." The German's Finnish teammate Kimi Raikkonen, who had been second before also being hit with a late puncture that sent Bottas and Vettel ahead of him, took third. At the halfway stage of the 20-race season, Vettel has 177 points to Hamilton's 176 with Bottas on 154. Hungary, a circuit where the Briton has won five times before, is next up. Hamilton became only the third driver, after his late compatriot Jim Clark and Frenchman Alain Prost, to win the British Grand Prix five times and the first to take four successive victories at Silverstone. Clark won four in a row in the 1960s, but one was at Aintree and another at Brands Hatch. Red Bull's Max Verstappen finished fourth, ending a run of retirements, with Australian teammate Daniel Ricciardo fifth after fighting through the field. Germany's Nico Hulkenberg was sixth for Renault and Force India pairing Esteban Ocon and Sergio Perez were eighth and ninth with Brazilian Felipe Massa securing the final point for Williams. Jolyon Palmer's miserable run continued, with Britain's only other driver on the grid failing to make the start after his Renault broke down on the formation lap with a brake failure.