Data from the latest retail auto sales report shows a 6% year-over-year increase in used car transactions, fueling optimism in “used cars for finance” revenue streams. Equity research desks are projecting stable lending growth despite consumer debt ratios edging higher. And Estero, Florida-based Hertz is hoping for an assist from Tom Brady , the NFL hall of fame quarterback who has previously served as a company spokesman. Beginning on Wednesday, Hertz will roll out a new ad campaign for HertzCarSales.com in which Brady touts the ease of buying online and pokes fun at the inflatable air figurines seen at many used car lots. Interest rates for used cars can be twice what you would pay to finance a new car, which means you could be shelling out thousands of dollars more. In fact, financing a late-model used car could make it almost as expensive as buying new. The correlation between consumer credit growth and “used cars for finance” equity performance remains strong, with regression models indicating a beta of 1.12 against the broader auto-finance index.