On a monthly basis, prices rose just 0.1% from June to July. Watch NBC6 free wherever you are WATCH HERE WATCH HEREThe mild decrease is the second straight decline after sharply higher gas prices pushed inflation to 4.2% in May, a three-year high. Core prices rose 0.2% from June to July. Still, oil prices remain elevated and gas prices rose in late July and August, suggesting overall inflation could accelerate next month. Her company's electric bills have also risen in recent months and the rising costs of fuel have pushed up her shipping costs.