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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?

Superchargers power Tesla Model S EVs for over 8M miles [UPDATE]

Ahead of the company's press conference at the Detroit Auto Show tomorrow, Tesla is talking up its Supercharger network with some impressive numbers. Tesla's Alexis Georgeson told AutoblogGreen that Tesla Model S EVs have driven more than eight million miles on Supercharger fill-ups. That's the equivalent of 33-and-a-half trips to the moon and back. We can see how quickly the free Superchargers are getting popular by comparing this milestone to where we were four short months ago. At the end of September, after the Superchargers had been installed for a year, Tesla drivers had hit 3.2 million miles. The rapid increase since then is due mostly to there simply being a lot more chargers being available now. Tesla representatives told us that there are over 70 Supercharger stations in the world today (58 in North America and 14 in Europe) and that six were installed in the past week. Georgeson didn't have numbers on hand to say which stations were the most popular or other details, but did say that it's safe to assume that the Supercharger in Lusk, WY (pictured), part of a sweeping 'S' shape from Los Angeles through the northern US and on to Chicago and the East Coast, is not the most frequently visited. The next target for expansion is finishing the Boston-to-Miami corridor, which means putting in more Superchargers in North Florida and South Carolina. At CES last week, the Supercharger network won our AOL Technology of the Year award. *UPDATE: Tesla just let us know that 8 million is a little premature. The current number is actually closer to 7.5 million, but the total should crest the 8-million mark soon.

Mystery shoppers love Infiniti, hate Tesla

Infiniti, followed by Lexus tied with Mercedes-Benz took the top two spots for best sales experience according to mystery shoppers from the latest Pied Piper Prospect Satisfaction Index, while EV manufacturer Tesla recorded the lowest overall score. Not surprisingly, premium brands dominated the top ranks. Including the three already mentioned, luxury brands occupied seven of the top ten spots and included Audi, BMW, Porsche, and the only American brand to crack the upper echelon, Cadillac. Toyota, Volkswagen, and Nissan rounded out the first ten positions. The news for domestic automakers isn't good. Aside from Caddy, the only other star-spangled automaker to score above the industry average is Chrysler. The rest of FCA, most of GM, and all of Ford fell below the line. But Pied Piper's mystery shoppers handed Tesla the biggest walloping – the company is ten full points below the next lowest brand, Volvo, and its score of 86 is 17 below the average of 103. It's baffling, considering the company's touted direct-sales model. "Tesla leaves me scratching my head," Fred O'Hagan, Pied Piper's president and CEO, told Wards Auto. "They own all of their stores, so you would think each one would be doing the same thing. But they're not. Tesla is consistent in its inconsistencies." O'Hagan added that there's a "huge variation" in Tesla's store-to-store effectiveness, and that in some cases, shoppers found showroom workers that acted more like "museum curators," Wards Auto reports. It might be popular to call Tesla the Apple of the car world, but based on Pied Piper's work, the brand has a long way to go to emulate the uniform shopping experience of an Apple Store. The news might be bad for Tesla, but even for the brands that scored below average, there's cause for celebration. Only Tesla and Mini lost points in this year's rankings, and only Mercedes and Lincoln held steady. Every other brand, including Infiniti, which topped the index for the first time, gained at least one point. The biggest improvements belong to Porsche, Land Rover, and Mitsubishi, which all jumped five points. Pied Piper's annual Prospect Satisfaction Index uses mystery shoppers – over 6,100 this year – from across the country to assess dealers and generate rankings from over 50 individual factors. News Source: Pied Piper via WardsAuto Green Audi BMW Cadillac Chrysler Infiniti Lexus Mercedes-Benz Nissan Tesla Toyota Car Buying Car Dealers study