LEMON GROVE, Calif. (KGTV) Pain at the pump is hitting San Diegans hard, and for small business owners, the impact is becoming increasingly difficult to absorb.The issue of rising gas prices and whether Californias gas tax should stay or go took center stage during the recent gubernatorial debate. But beyond the political stage, the real-world effects are playing out in communities like Lemon Grove.Along Federal Boulevard, Birrieria La Loteria h…