While gas prices have remained low for several months, consumers haven't been spending the savings at the pump. Instead, they have been bolstering their savings accounts and paying down debt. But that soon may change, as consumers begin to realize that low gas prices are here to stay. TheStreet's Scott Gamm sat down with Mark Zandi, chief economist at Moody's Analytics in an exclusive on-camera interview to discuss how consumers will save $120 billion from low gas prices, his take on the state of the economic recovery and when the Federal Reserve will raise short-term interest rates.