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Figuring out exactly how much it costs to charge Tesla Model S

Is the Tesla Model S an electricity guzzler? One driver trying to answer that question says it does gobble down more juice than previously thought, but it's not time to make Hummer jokes just yet. First, the goal: Tesla's claims that properly set up home-charging stations can get about a 91-percent efficiency rate. Rob M. from Teslarati has been diligently tracking electricity used by his home charging station – made up of a NEMA 14-50 outlet that was professionally installed and Tesla's Universal Mobile Connector (UMC) – since June, as we reported here. The results for the month that ended July 21 revealed that the Model S was taking in about 82 percent of the electricity it was pulling from the system, indicating an 18-percent loss of electricity. Most EVs are thought to charge at an 88 to 90-percent efficiency rate. The downside to his results? About $26 more per month in electricity costs than previously estimated on about 2,400 miles worth of driving. There is a positive upshot, though: his monthly fuel savings totaled about $334 compared to driving an internal combustion engine vehicle. These early results are intriguing, and make us wonder... Is anyone else checking in on their Model S charging efficiency?

Cadillac tops Tesla in Consumer Reports semi-automated driving test

General Motors' Cadillac outscored Tesla in a new ranking of partially automated driving systems tested by Consumer Reports and released on Thursday. The highly influential nonprofit organization, which tests and rates a variety of consumer products from appliances to vehicles, said it compared Cadillac's Super Cruise and Tesla's Autopilot with similar systems from Nissan and Volvo. Nissan's ProPilot Assist was ranked third and Volvo's Pilot Assist fourth. Consumer Reports said it has been testing partially automated driving systems for several years but elected to conduct a formal study intended for publication, because "we are at a tipping point where they are now going mainstream," according to Jake Fisher, director of auto testing. The organization said its tests, conducted on a private track and on public roads in Connecticut, were designed to measure the systems' ability to automatically control steering and speed in certain situations, while helping drivers pay attention and regain manual control of the vehicle when required. CR noted that any of these systems can increase driving risk if used in inappropriate situations, or if drivers become inattentive or over-reliant on them. While they can help relieve driver stress and fatigue, Consumer Reports said, the partially automated systems are "not intended to be self-driving features." The systems typically use cameras, radar and other sensors, as well as mapping data, to monitor location and traffic conditions and help keep a vehicle centered in the lane at a safe distance behind other cars. Each system has limitations. Cadillac's Super Cruise, for instance, only functions on divided highways that have been mapped by GM. In contrast, Tesla's Autopilot can be used even on small, curvy roads with poor lane markings, but "operates erratically in those situations," Consumer Reports said.The organization tested Super Cruise on the Cadillac CT6; Autopilot on the Tesla Model 3, Model X and Model S; ProPilot Assist on the Nissan Leaf and Infiniti QX50; and Pilot Assist on the Volvo XC40 and XC60. Consumer Reports said Cadillac's Super Cruise did "the best job of balancing high-tech capabilities with ensuring the car is operated safely and the driver is paying attention." Tesla's Autopilot was cited for its capability and ease of use, while Nissan's ProPilot Assist did a better job than Autopilot or Volvo's Pilot Assist in keeping drivers engaged.

Tesla is quietly installing higher-speed, non-Supercharger network [UPDATE]

UPDATE: We've received confirmation from Tesla on details of the charging network, and have updated the text below accordingly. To a Tesla Model S driver, 58 miles an hour is pretty tepid when it comes to driving speed. Recharging speed, though? That's a pretty good clip. The California-based automaker is complementing the deployment of it high-powered Superchargers with slightly-less-super wall chargers that supply 80 amps and can provide almost 60 miles worth of driving in one hour of charging. That's about twice as fast as a 240-volt charger, though it's a fraction of the juice provided by the Superchargers that Tesla is building on at least three continents. The Tesla Destination Charging Program, recently covered in The Wall Street Journal, features the Tesla High Power Wall Connector. Those devices have been deployed at almost 110 hotels, beach parking lots and restaurants in North America, Tesla spokeswoman Alexis Georgeson confirmed to AutoblogGreen in an e-mail. Tesla just launched the program this spring and lists those chargers' locations on its website (www.teslamotors.com/findus). With such chargers in place, getting 58 miles to the hour will be valuable for day-tripping Model S drivers who are just looking to get home without a tow. And, like the Superchargers, the wall chargers are free to use. "By offering convenient destination charging services to Model S owners, these hotels and resorts are replicating the convenience our owners have become accustomed to at home," Georgeson said. Tesla has deployed 111 Supercharger stations across North America, in addition to 59 stations in Europe and 13 in Asia. Neither the Superchargers nor the wall chargers are compatible with any other electric vehicles, so no soup for you, Nissan Leaf drivers.