 The cost of living actually fell slightly between May and June, as a drop in gasoline prices more than outweighed the modest monthly rise in rents. Grocery prices rose just a tenth of a percent during the month, while restaurant prices rose four-tenths. Airfares and new and used car prices were down in June. So-called core inflation, which excludes volatile food and energy prices, was also somewhat better than expected. At 3.3 percent, it's the lowest in more than three years.