Joining up on fossil fuel powered vehicles makes sense too. These will contribute less to most automakers�� top line as policymakers demand cars are cleaner. But the numbers could stay significant for years or decades. Roughly 50 million internal combustion engine models were sold last year, per the International Organization of Motor Vehicle Manufacturers and the International Energy Agency. Meanwhile stringent environmental regulations make it increasingly irksome and costly to design and manufacture such models. Off-the-shelf solutions would be an affordable alternative. 
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International Organization of Motor Vehicle Manufacturers
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International Energy Agency