Brand MarketingGSTVBy Katy Bachman |July 28, 2008ShareBy Katy Bachman |July 28, 2008ShareGas Station TV is pumping up its digital out-of-home network, launching a companion network in convenience stores.The new digital network, C-Store TV, launches today (July 28) in Boston, followed by Los Angeles and New York. By the end of the year, C-Store TV said it will be in up to 12 markets and deliver 10 million monthly impressions.The largest of the three networks offering advertising at the pump, GSTV is also widening its reach into new markets, adding Orlando this week and Phoenix and Seattle this fall, for a total of 22 markets.By year Adweek Adweek