General Motors Financial Co. yesterday priced its largest bond backed by subprime auto loans since 2007, garnering the lowest yields in more than a year, relative to an interest rate benchmark, the Wall Street Journal reported today. The consumer lending unit of General Motors Co. increased the size of its offering by $200 million to $1.4 billion, just shy of its $1.5 billion issue it sold in July 2007. Earlier yesterday, GM said its May sales jumped 13 percent to 284,694, easily topping expectations as the company contends with the fallout from a steady flow of recalls over safety concerns.