The Tokyo core consumer price index, which excludes volatile fresh food but includes fuel costs, rose 2.8 percent in August from a year earlier, slowing from a 3.0 percent rise in July, according to the internal affairs ministry.
The data for Tokyo, which is seen as a leading indicator of nationwide trends, remained well above the Bank of Japan's 2-percent target for the 15th straight month.
Lower fuel prices pushed down energy costs, with electricity bills dropping 22 percent and gas 14 percent.
Meanwhile, prices of food excluding fresh items soared almost 9 percent.
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