Motor vehicle insurance costs fell 0.3 percent in July, the Bureau of Labor Statistics reported, extending a run of disinflation in a services category that had been one of the stickiest contributors to elevated CPI. June posted a steeper 2.0 percent decline.

The drops matter to fixed-income traders because services inflation—particularly insurance, shelter and medical care—has been the Fed's last stubborn obstacle on the path to 2 percent. Two consecutive monthly declines in auto insurance narrow the spread between headline and services-ex-shelter, a metric Fed officials have flagged repeatedly.

The U.S. Consumer Price Index rose 0.1 percent in July, holding the annual rate at 3.4 percent—still 140 basis points above the Fed's target and enough to keep duration risk elevated for anyone positioned for early cuts.

Food at home fell 0.1 percent. Within that category, the meats, poultry, fish and eggs index dropped 0.7 percent, with pork prices down 1.5 percent. Fruits and vegetables declined 0.1 percent.

Offsetting those declines, new vehicles, household furnishings and operations, and apparel all rose. Medical care, airline fares, communication, education and recreation costs also increased.

With annual inflation at 3.4 percent, the Fed has no statistical cover to ease. The mixed July print—deflationary impulses in goods and select services, persistent pressure elsewhere—reinforces a cautious posture on rate adjustments heading into the September meeting.