Monthly car sales come out tomorrow. After tomorrow, GM will only report quarterly, except to the Fed.

GM claims monthly sales reports are inaccurate, so it will switch to quarterly reports.

General Motors Co. said on Tuesday it will stop reporting monthly U.S. vehicle sales, saying the 30-day snapshot does not accurately reflect the market and will instead issue quarterly sales.

“Thirty days is not enough time to separate real sales trends from short-term fluctuations in a very dynamic, highly competitive market,” Kurt McNeil, U.S. vice president for sales operations said in a statement.

GM will also no longer report monthly sales in China, its largest market, and Brazil. GM will provide monthly data to the U.S. Federal Reserve, industry associations and government agencies across the globe but that data is not made public.

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