Carson City’s Richard Langson, who turned big-time energy use into similar energy production, took his two cents’ worth to Texas on Wednesday. The head of Langson Energy Inc., who 20 years ago burned 50 gallons fuel per mile as a drag-racing champion, now tells the world about low-cost electrical power from his steam and gas turbo-expanders. The power is generated for as low as two cents per kilowatt, he says. But it all started with racing. “That’s the funny part,” he said before heading to Dallas and the Southern Methodist University campus, where his energy technology was being demonstrated. “The …