The average gallon of self serve regular in the Los Angeles area was $3.248 for the period ended Aug. 14, up from $3.232 a week earlier. That's the first time since early July that prices have risen, according to a survey by the federal Energy Information Administration. Different surveys are finding different results, but the numbers are not moving much. Oil industry analyst Triby Lundberg expects retail prices to slide, barring any dramatic news bulletins. There's just a lot of supply out there. After Labor Day, as demand begins to fall, so should pump prices.