XM Satellite Radio (NSDQ: XMSR) announced Q3 revenue growth of 20 percent, rising to $287 million from $240 million. Gains were fueled by net subscriber adds of 315,000, up from 286,000 last year, for a total customer base of 8.57 million. But net losses expanded 72.6 percent to $145 million from $84 million, as the company saw higher royalty expenses, retention costs and an increased marketing budget. Altogether, the company’s cost per gross addition (CPGA) rose to $116, from $94 a year ago. Other highlights:

—700,000 of 952,000 gross adds came from automotive pre-installations.

—Net advertising sales hit $10.7 million, up from $8.8 million last year.

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