Marin hotels saw more customers and increased revenue for the second consecutive year in 2012, suggesting that rising gas prices and a faltering economic recovery are having a muted impact on the county’s linchpin tourism industry. Hotel and motel occupancy grew to 73.1 percent in 2012, from 68.7 percent in 2011, which, after the East San Francisco Bay area, had the second highest increase among Northern California regions tracked by a hospitality consulting firm. The…