According to a blog post and an infographic, the growing epidemic of obese motorists in America may be cutting into the efforts of automakers to reduce the weight of passenger vehicles, and therefore to increase the miles per gallon of fuel. Obese motorists lower fuel efficiency To meet future emissions standards set by the federal Read on! → has slugged it out with mountains of April sales data and returned with its list of the fastest and slowest selling cars of April. Although it lost some ranking from March, Toyota’s Prius Plug-In — only available for two months — is proving itself a rapidly rising star. Prius leads the hybrid pack With Read on! →