General Motors Co. (GM) was sued on behalf of vehicle owners over an ignition flaw in some small-model cars as it faces regulators’ questions about this year’s recall of 1.6 million vehicles. Bob Hilliard, one of the lawyers who filed the complaint yesterday in federal court in Corpus Christi, Texas, said he seeks to recover $6 billion to $10 billion for the lost value of cars affected by the recall.