CNN: Oil speculation has been getting a lot of attention from Congress lately. On Thursday lawmakers took up another possible solution: getting more miles per gallon out of cars Americans drive. Last December, Congress passed the Energy Information and Security Act (EISA), which mandated that the car standards and light truck standards be set high enough to ensure that the combined industry-wide average reaches at least 35 mpg in model year 2020. But since then, the issue has taken …