Gross Profit . Total gross profit increased 11% to $381.7 million. Used vehicle gross profit rose 16%, driven by the increase in total used unit sales, while used vehicle gross profit per unit remained comparable with the prior year period at $2,149. Wholesale vehicle gross profit was similar to the prior year’s quarter, as the 4% increase in wholesale unit sales was offset by a decrease in wholesale vehicle gross profit per unit, which declined $36 to $887. Other gross profit rose 2%, reflecting flat ESP revenues and the decrease in net third-party finance fees, as well as higher service department profits.
SG&A . Selling, general and administrative expenses increased 11% to $284.4 million. The increase primarily reflected both the 12% increase in our store base since the beginning of last year’s third quarter (representing the addition of 13 stores) and higher variable selling costs resulting from our 10% increase in comparable store used unit sales. SG&A per retail unit declined $98 to $2,295, as our comparable store used unit sales growth generated overhead leverage.
CarMax Auto Finance . (1) CAF income increased 16% to $83.9 million as a result of the 24% increase in average managed receivables, partly offset by a lower total interest margin. Average managed receivables grew to $6.81 billion, reflecting the rise in CAF loan originations in recent years. The total interest margin, which reflects the spread between interest and fees charged to consumers and our funding costs, declined to 6.8% of average managed receivables in the current quarter from 7.4% in last year’s third quarter.
In the fourth quarter of fiscal 2014, CAF plans to launch a test originating loans for customers who typically would be financed by our subprime providers. Given the relevance of subprime to our business and the overall market, we believe it is prudent to gain further insight into underwriting and servicing accounts within this credit profile. Over the next 12 months, we plan to originate approximately $70 million of loans in this test. The test will be funded separately from our current portfolio and not included in our current public securitization program.